Upgrade to Protobuf 35.1

[shivaspeaks]

Per https://github.com/protocolbuffers/protobuf/releases

okshiva@okshiva-mac2 grpc-java % curl -sL https://github.com/protocolbuffers/protobuf/releases/download/v35.1/protobuf-35.1.tar.gz | shasum -a 256

f0b6838e7522a8da96126d487068c959bc624926368f3024ac8fd03abd0a1ac4

[shivaspeaks]

Note:
While upgrading Protobuf to 35.1, two secondary Bazel dependencies (rules_proto and rules_android) had to be addressed to keep the CI green. Here is the context:

1. Added rules_proto to repositories.bzl and MODULE.bazel.
   The googleapis dependency requires rules_proto to build. During the CI job (--enable_bzlmod=false), the build failed during the analysis phase because googleapis could no longer implicitly fetch rules_proto via Protobuf.

2. Upgraded to rules_android v0.7.3
   Previous version of rules_android (v0.7.2) explicitly hardcoded "com.google.protobuf:protobuf-java:4.33.4" in its internal maven artifacts. During the Android CI job, Bazel used our newly upgraded 35.1 compiler to generate internal Android resource files (gencode 4.35.1). However, because rules_android's internal tools (like ResourceProcessorBusyBox) were locked to the 4.33.4 runtime, it triggered a ProtobufRuntimeVersionException (poison pill).