[Tests] Fix build scripts for linux portability (#36220)

Ref: b/332425004

Adding a workaround for x86 builds that run into trouble with using an installed abseil library.

Closes #36220

COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/36220 from yashykt:FixPortabilityLinux 672ccdb3ff
PiperOrigin-RevId: 621259080

tools/run_tests/helper_scripts/build_cxx.sh

@@ -39,8 +39,12 @@ cd ../../..
 mkdir -p cmake/build
 cd cmake/build
 
-# MSBUILD_CONFIG's values are suitable for cmake as well
+# TODO(yashykt/veblush): Remove workaround after fixing b/332425004 
+if [ "${GRPC_RUNTESTS_ARCHITECTURE}" = "x86" ]; then
+cmake -DCMAKE_CXX_STANDARD=14 -DgRPC_BUILD_TESTS=ON -DCMAKE_BUILD_TYPE="${MSBUILD_CONFIG}" "$@" ../..
+else
 cmake -DCMAKE_CXX_STANDARD=14 -DgRPC_BUILD_GRPCPP_OTEL_PLUGIN=ON -DgRPC_ABSL_PROVIDER=package -DgRPC_BUILD_TESTS=ON -DCMAKE_BUILD_TYPE="${MSBUILD_CONFIG}" -DCMAKE_INSTALL_PREFIX="${INSTALL_PATH}" "$@" ../..
+fi
 
 # GRPC_RUN_TESTS_CXX_LANGUAGE_SUFFIX will be set to either "c" or "cxx"
 make -j"${GRPC_RUN_TESTS_JOBS}" "buildtests_${GRPC_RUN_TESTS_CXX_LANGUAGE_SUFFIX}" "tools_${GRPC_RUN_TESTS_CXX_LANGUAGE_SUFFIX}"

tools/run_tests/run_tests.py

@@ -534,6 +534,8 @@ class CLanguage(object):
             environ[
                 "GRPC_BUILD_VS_TOOLS_ARCHITECTURE"
             ] = self._vs_tools_architecture_windows
+        elif self.platform == "linux":
+            environ["GRPC_RUNTESTS_ARCHITECTURE"] = self.args.arch
         return environ
 
     def post_tests_steps(self):