Switch to the Go Protobuf compiler v2

This allows us to get rid of the local ServiceRegistrar patch we had to
apply on top of the compiler.

BUILD.bazel

@@ -2,7 +2,7 @@ load("@com_github_bazelbuild_buildtools//buildifier:def.bzl", "buildifier")
 load("@com_github_buildbarn_bb_storage_npm//:defs.bzl", "npm_link_all_packages")
 load("@gazelle//:def.bzl", "gazelle")
 
-# gazelle:go_grpc_compilers @rules_go//proto:go_grpc
+# gazelle:go_grpc_compilers @rules_go//proto:go_proto,@rules_go//proto:go_grpc_v2
 # gazelle:prefix github.com/buildbarn/bb-storage
 # gazelle:resolve go github.com/google/go-jsonnet @google_jsonnet_go//:go_default_library
 # gazelle:resolve proto build/bazel/remote/execution/v2/remote_execution.proto @com_github_bazelbuild_remote_apis//build/bazel/remote/execution/v2:remote_execution_proto

MODULE.bazel

@@ -79,6 +79,7 @@ go_deps_dev = use_extension("@gazelle//:extensions.bzl", "go_deps", dev_dependen
 go_deps_dev.gazelle_override(
     build_file_generation = "on",
     directives = [
+        "gazelle:go_grpc_compilers @io_bazel_rules_go//proto:go_proto,@io_bazel_rules_go//proto:go_grpc_v2",
         "gazelle:resolve proto go build/bazel/semver/semver.proto //build/bazel/semver",
         "gazelle:resolve proto go google/api/annotations.proto @org_golang_google_genproto_googleapis_api//annotations",
         "gazelle:resolve proto go google/longrunning/operations.proto @com_google_cloud_go_longrunning//autogen/longrunningpb",
@@ -93,10 +94,6 @@ go_deps_dev.module_override(
     patches = ["//:patches/com_github_golang_mock/mocks-for-funcs.diff"],
     path = "github.com/golang/mock",
 )
-go_deps_dev.module_override(
-    patches = ["//:patches/com_github_golang_protobuf/service-registrar.diff"],
-    path = "github.com/golang/protobuf",
-)
 go_deps_dev.module_override(
     patches = ["//:patches/com_github_grpc_ecosystem_go_grpc_prometheus/client-metrics-prevent-handled-twice.diff"],
     path = "github.com/grpc-ecosystem/go-grpc-prometheus",

pkg/proto/fsac/BUILD.bazel

@@ -14,7 +14,10 @@ proto_library(
 
 go_proto_library(
     name = "fsac_go_proto",
-    compilers = ["@rules_go//proto:go_grpc"],
+    compilers = [
+        "@rules_go//proto:go_proto",
+        "@rules_go//proto:go_grpc_v2",
+    ],
     importpath = "github.com/buildbarn/bb-storage/pkg/proto/fsac",
     proto = ":fsac_proto",
     visibility = ["//visibility:public"],