Use YARPC protobuf v2 codegen

[albertywu]

Summary

The previous yarpc transport code was compiled for gogo/protobuf, which is incompatible with proto v2 shapes + structs.

This PR fixes the yarpc transport code to use proto v2.

Before Example:

gateway.pb.go <-- [✅ proto v2] shapes + structs
gateway_grpc.pb.go <-- [✅ proto v2] grpc transport
gateway.pb.yarpc.go <-- [❌ gogo/protobuf] yarpc transport; should be using proto v2 instead of gogo

After Example:

gateway.pb.go <-- [✅ proto v2] shapes + structs
gateway_grpc.pb.go <-- [✅ proto v2] grpc transport
gateway.pb.yarpc.go <-- [✅ proto v2] yarpc transport

Test Plan

✅make fmt && make build && make test && make e2e-test

[Copilot]

Pull request overview

This PR migrates the repository’s YARPC protobuf stub generation to the YARPC protobuf v2 codegen/tooling, updating generated client/server glue to use go.uber.org/yarpc/encoding/protobuf/v2 and removing the legacy gogo/protobuf dependency from the build configuration.

Changes:

• Switch Bazel proto codegen to use protoc-gen-yarpc-go-v2 and --yarpc-go-v2_{out,opt} flags.
• Regenerate YARPC .pb.yarpc.go stubs to use YARPC protobuf v2 APIs and google.golang.org/protobuf/proto.
• Update Bazel deps / module deps and Go module deps to drop gogo/protobuf and depend on the Google protobuf module.

Reviewed changes

Copilot reviewed 7 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tool/proto/proto_codegen.bzl	Updates Bazel proto generation to invoke the YARPC protobuf v2 plugin and flags.
submitqueue/orchestrator/protopb/orchestrator.pb.yarpc.go	Regenerated YARPC stubs to use encoding/protobuf/v2 APIs and Google protobuf proto.Message.
submitqueue/orchestrator/protopb/BUILD.bazel	Updates Go library deps to match regenerated stubs (adds google protobuf + YARPC protobuf v2).
submitqueue/gateway/protopb/gateway.pb.yarpc.go	Regenerated YARPC stubs to use encoding/protobuf/v2 APIs and Google protobuf proto.Message.
submitqueue/gateway/protopb/BUILD.bazel	Updates Go library deps to match regenerated stubs (adds google protobuf + YARPC protobuf v2).
stovepipe/orchestrator/protopb/orchestrator.pb.yarpc.go	Regenerated YARPC stubs to use encoding/protobuf/v2 APIs and Google protobuf proto.Message.
stovepipe/orchestrator/protopb/BUILD.bazel	Updates Go library deps to match regenerated stubs (adds google protobuf + YARPC protobuf v2).
stovepipe/gateway/protopb/gateway.pb.yarpc.go	Regenerated YARPC stubs to use encoding/protobuf/v2 APIs and Google protobuf proto.Message.
stovepipe/gateway/protopb/BUILD.bazel	Updates Go library deps to match regenerated stubs (adds google protobuf + YARPC protobuf v2).
MODULE.bazel	Removes Bazel module repo usage for com_github_gogo_protobuf.
go.mod	Removes github.com/gogo/protobuf (and related indirects) from module requirements.
go.sum	Updates sums to reflect dependency graph changes after removing direct gogo usage.

Files not reviewed (4)

• stovepipe/gateway/protopb/gateway.pb.yarpc.go: Language not supported
• stovepipe/orchestrator/protopb/orchestrator.pb.yarpc.go: Language not supported
• submitqueue/gateway/protopb/gateway.pb.yarpc.go: Language not supported
• submitqueue/orchestrator/protopb/orchestrator.pb.yarpc.go: Language not supported

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