bazel: rename io_bazel_rules_go to rules_go

[Copilot]

This updates Envoy’s last major pre-bzlmod repository rename from io_bazel_rules_go to rules_go, matching the BCR module name. The change also preserves WORKSPACE-era compatibility for transitive deps that still hardcode @io_bazel_rules_go.

• Repository rename + metadata alignment

  • Renames the root external repo from io_bazel_rules_go to rules_go.
  • Updates Bazel metadata to use rules_go as the canonical key while retaining the legacy apparent name where dependency metadata expects it.
  • Drops the repo_name = "io_bazel_rules_go" override in api/MODULE.bazel so bzlmod uses rules_go directly.

• Direct label migration

  • Rewrites in-repo loads and label references from @io_bazel_rules_go//... to @rules_go//....
  • Covers API build logic, injected BUILD content, dynamic module test data, and Go BUILD files under contrib/ and related test fixtures.

• WORKSPACE-side compatibility shims

  • Keeps _go_deps() backward-compatible with both io_bazel_rules_go and rules_go in skip_targets.
  • Adds repo_mapping = {"@io_bazel_rules_go": "@rules_go"} to external repos known to consume rules_go transitively, including:
    • gazelle
    • rules_proto_grpc
    • googleapis
    • com_envoyproxy_protoc_gen_validate
    • com_github_chrusty_protoc_gen_jsonschema
    • CEL-related repos
    • Envoy go_repository(...) declarations in root and mobile dependency macros

• Generated / injected repo fixes

  • Updates API-injected BUILD snippets to load from @rules_go.
  • Adds a small rules_go patch so WORKSPACE-generated toolchain/dependency repos emit @rules_go instead of @io_bazel_rules_go.
  • Adds a focused googleapis patch so its generated imports repo resolves Go rules through @rules_go as well.

Example of the label transition applied throughout the tree:

load("@rules_go//go:def.bzl", "go_library")
load("@rules_go//proto:def.bzl", "go_proto_library")

[repokitteh-read-only]

As a reminder, PRs marked as draft will not be automatically assigned reviewers,
or be handled by maintainer-oncall triage.

Please mark your PR as ready when you want it to be reviewed!

🐱

Caused by: #46926 was opened by Copilot.

see: more, trace.