Rework release workflows using Github runners (replacing Zig)

[sampajano]

This PR modernizes the grpc-web release workflows by migrating from make/Zig-based build systems to Bazel across all platforms, and updates GitHub Actions to use current versions.

Main changes:

• Removes Zig build system and migrates all platforms to use Bazel for building the protoc plugin
• Standardizes version handling across workflows with dynamic computation from inputs or Git refs
• Updates GitHub Actions versions and adds support for ARM64 runners on all platforms

References

Github hosted runners:
https://docs.github.com/en/actions/reference/runners/github-hosted-runners

Fixes #1495
For #1466 :)

[Copilot]

Pull Request Overview

This PR modernizes the grpc-web release workflows by migrating from make/Zig-based build systems to Bazel across all platforms, and updates GitHub Actions to use current versions. The changes address macOS build issues while improving consistency and maintainability of the build process.

• Removes Zig build system and migrates all platforms to use Bazel for building the protoc plugin
• Standardizes version handling across workflows with dynamic computation from inputs or Git refs
• Updates GitHub Actions versions and adds support for ARM64 runners on all platforms

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
.github/workflows/make-plugin-windows.yml	Migrated from x86_64-only to multi-arch (including ARM64) with Bazel build system
.github/workflows/make-plugin-mac-os.yml	Replaced make-based build with Bazel and added ARM64 support
.github/workflows/make-plugin-linux.yml	Migrated from Docker-based build to direct Bazel build with ARM64 support
.github/workflows/make-plugin-arm.yml	Removed Zig-based ARM plugin workflow (functionality moved to other workflows)
javascript/net/grpc/web/generator/build.zig	Removed Zig build configuration file
.bazelrc.windows	Added Windows-specific Bazel configuration
.bazelrc	Simplified main Bazel configuration with cleaner formatting
net/grpc/gateway/docker/protoc_plugin/Dockerfile	Added TODO comment about migrating to Bazel
.github/workflows/release-source-archive.yml	Updated checkout action to v3

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