Revert "[objc] Turn on error exit in cocoapod pre-install (#27474)" (#27497)

This reverts commit c3759da7cc.

gRPC-C++.podspec

@@ -1528,7 +1528,6 @@ Pod::Spec.new do |s|
   end
 
   s.prepare_command = <<-END_OF_COMMAND
-    set -e
     find src/core -type f \\( -path '*.h' -or -path '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include <openssl/(.*)>;#if COCOAPODS==1\\\n  #include <openssl_grpc/\\1>\\\n#else\\\n  #include <openssl/\\1>\\\n#endif;g'
     find third_party/upb/ -type f \\( -name '*.h' -or -name '*.hpp' -or -name '*.c' -or -name '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "third_party/(.*)";#if COCOAPODS==1\\\n  #include  "third_party/upb/third_party/\\1"\\\n#else\\\n  #include  "third_party/\\1"\\\n#endif;g'
     find src/core/ src/cpp/ third_party/upb/ -type f \\( -name '*.h' -or -name '*.hpp' -or -name '*.c' -or -name '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "upb/(.*)";#if COCOAPODS==1\\\n  #include  "third_party/upb/upb/\\1"\\\n#else\\\n  #include  "upb/\\1"\\\n#endif;g'

gRPC-Core.podspec

@@ -2280,7 +2280,6 @@ Pod::Spec.new do |s|
 
   # TODO (mxyan): Instead of this hack, add include path "third_party" to C core's include path?
   s.prepare_command = <<-END_OF_COMMAND
-    set -e
     find src/core -type f \\( -path '*.h' -or -path '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include <openssl/(.*)>;#if COCOAPODS==1\\\n  #include <openssl_grpc/\\1>\\\n#else\\\n  #include <openssl/\\1>\\\n#endif;g'
     find third_party/upb/ -type f \\( -name '*.h' -or -name '*.hpp' -or -name '*.c' -or -name '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "third_party/(.*)";#if COCOAPODS==1\\\n  #include  "third_party/upb/third_party/\\1"\\\n#else\\\n  #include  "third_party/\\1"\\\n#endif;g'
     find src/core/ src/cpp/ third_party/upb/ -type f \\( -name '*.h' -or -name '*.hpp' -or -name '*.c' -or -name '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "upb/(.*)";#if COCOAPODS==1\\\n  #include  "third_party/upb/upb/\\1"\\\n#else\\\n  #include  "upb/\\1"\\\n#endif;g'

src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec

@@ -112,7 +112,6 @@ Pod::Spec.new do |s|
   # present in this pod's directory. We use that knowledge to check for the existence of the file
   # and, if absent, compile the plugin from the local sources.
   s.prepare_command = <<-CMD
-    set -e
     #{bazel} build //src/compiler:grpc_cpp_plugin
   CMD
 end

src/objective-c/!ProtoCompiler-gRPCPlugin.podspec

@@ -121,7 +121,6 @@ Pod::Spec.new do |s|
   # present in this pod's directory. We use that knowledge to check for the existence of the file
   # and, if absent, compile the plugin from the local sources.
   s.prepare_command = <<-CMD
-    set -e
     if [ ! -f #{plugin} ]; then
       #{bazel} build //src/compiler:grpc_objective_c_plugin
     fi

src/objective-c/!ProtoCompiler.podspec

@@ -123,7 +123,6 @@ Pod::Spec.new do |s|
   bazel = "#{repo_root}/tools/bazel"
   
   s.prepare_command = <<-CMD
-    set -e
     if [ ! -f bin/protoc ]; then
       #{bazel} build @com_google_protobuf//:protoc
     else

src/objective-c/BoringSSL-GRPC.podspec

@@ -152,7 +152,6 @@ Pod::Spec.new do |s|
   end
 
   s.prepare_command = <<-END_OF_COMMAND
-    set -e
     # Add a module map and an umbrella header
     mkdir -p src/include/openssl
     cat > src/include/openssl/umbrella.h <<EOF

templates/gRPC-C++.podspec.template

@@ -201,7 +201,6 @@
     end
 
     s.prepare_command = <<-END_OF_COMMAND
-      set -e
       find src/core -type f \\( -path '*.h' -or -path '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include <openssl/(.*)>;#if COCOAPODS==1\\\n  #include <openssl_grpc/\\1>\\\n#else\\\n  #include <openssl/\\1>\\\n#endif;g'
       find third_party/upb/ -type f \\( -name '*.h' -or -name '*.hpp' -or -name '*.c' -or -name '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "third_party/(.*)";#if COCOAPODS==1\\\n  #include  "third_party/upb/third_party/\\1"\\\n#else\\\n  #include  "third_party/\\1"\\\n#endif;g'
       find src/core/ src/cpp/ third_party/upb/ -type f \\( -name '*.h' -or -name '*.hpp' -or -name '*.c' -or -name '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "upb/(.*)";#if COCOAPODS==1\\\n  #include  "third_party/upb/upb/\\1"\\\n#else\\\n  #include  "upb/\\1"\\\n#endif;g'

templates/gRPC-Core.podspec.template

@@ -249,7 +249,6 @@
 
     # TODO (mxyan): Instead of this hack, add include path "third_party" to C core's include path?
     s.prepare_command = <<-END_OF_COMMAND
-      set -e
       find src/core -type f \\( -path '*.h' -or -path '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include <openssl/(.*)>;#if COCOAPODS==1\\\n  #include <openssl_grpc/\\1>\\\n#else\\\n  #include <openssl/\\1>\\\n#endif;g'
       find third_party/upb/ -type f \\( -name '*.h' -or -name '*.hpp' -or -name '*.c' -or -name '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "third_party/(.*)";#if COCOAPODS==1\\\n  #include  "third_party/upb/third_party/\\1"\\\n#else\\\n  #include  "third_party/\\1"\\\n#endif;g'
       find src/core/ src/cpp/ third_party/upb/ -type f \\( -name '*.h' -or -name '*.hpp' -or -name '*.c' -or -name '*.cc' \\) -print0 | xargs -0 -L1 sed -E -i'.grpc_back' 's;#include "upb/(.*)";#if COCOAPODS==1\\\n  #include  "third_party/upb/upb/\\1"\\\n#else\\\n  #include  "upb/\\1"\\\n#endif;g'

templates/src/objective-c/!ProtoCompiler-gRPCCppPlugin.podspec.template

@@ -114,7 +114,6 @@
     # present in this pod's directory. We use that knowledge to check for the existence of the file
     # and, if absent, compile the plugin from the local sources.
     s.prepare_command = <<-CMD
-      set -e
       #{bazel} build //src/compiler:grpc_cpp_plugin
     CMD
   end

templates/src/objective-c/!ProtoCompiler-gRPCPlugin.podspec.template

@@ -123,7 +123,6 @@
     # present in this pod's directory. We use that knowledge to check for the existence of the file
     # and, if absent, compile the plugin from the local sources.
     s.prepare_command = <<-CMD
-      set -e
       if [ ! -f #{plugin} ]; then
         #{bazel} build //src/compiler:grpc_objective_c_plugin
       fi

templates/src/objective-c/!ProtoCompiler.podspec.template

@@ -125,7 +125,6 @@
     bazel = "#{repo_root}/tools/bazel"
     
     s.prepare_command = <<-CMD
-      set -e
       if [ ! -f bin/protoc ]; then
         #{bazel} build @com_google_protobuf//:protoc
       else

templates/src/objective-c/BoringSSL-GRPC.podspec.template

@@ -182,7 +182,6 @@
     end
 
     s.prepare_command = <<-END_OF_COMMAND
-      set -e
       # Add a module map and an umbrella header
       mkdir -p src/include/openssl
       cat > src/include/openssl/umbrella.h <<EOF