Regenerate C# files as part of staleness checks

PiperOrigin-RevId: 502333394

regenerate_stale_files.sh

@@ -11,3 +11,10 @@ cd $(dirname -- "$0")
 # Run and fix all staleness tests.
 bazel test //src:cmake_lists_staleness_test || ./bazel-bin/src/cmake_lists_staleness_test --fix
 bazel test //src/google/protobuf:well_known_types_staleness_test || ./bazel-bin/src/google/protobuf/well_known_types_staleness_test --fix
+
+# Generate C# code.
+# This doesn't currently have Bazel staleness tests, but there's an existing
+# shell script that generates everything required. The output files are stable,
+# so just regenerating in place should be harmless. 
+bazel build src/google/protobuf/compiler:protoc
+(export PROTOC=$PWD/bazel-bin/protoc && cd csharp && ./generate_protos.sh)