Swap to using google.golang.org/protobuf/cmd/protoc-gen-go instead of github.com/golang/protobuf/protoc-gen-go (#37685)

* Reformat Args in steps definitions

* Swap to using the new version of protoc-gen-go that doesn't include grpc support (instead it relies on protoc-gen-go-grpc).

Update command flags to reflect this change in tooling.

See this comment for explanation: golang/protobuf#1070 (comment)

* Run `make protobuf` with problem generate steps commented out.

* Use `require_unimplemented_servers=false` to minimise changes at the time of upgrading tooling

In future we can navigate the consequences of this in its own PR.

* WIP

* Fix out/opt typo, add remaining flags once terraform1.proto was being found ok

* Run `make protobuf`

* `go get google.golang.org/grpc/cmd/[email protected]` && `go mod tidy`

This version includes a feature that allows the copyright comment in the .proto file to be pulled across to generated _grpc.pb.go files.

* Run `make protobuf` with new version of protoc-gen-go-grpc that allows copyright comment to be copied to generated output files

* Potential fix for `internal/rpcapi/dynrpcserver/generator`

Author: SarahFrench

go.mod

@@ -82,7 +82,7 @@ require (
 	golang.org/x/tools v0.36.0
 	golang.org/x/tools/cmd/cover v0.1.0-deprecated
 	google.golang.org/grpc v1.69.4
-	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.2.0
+	google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.3.0
 	google.golang.org/protobuf v1.36.6
 	honnef.co/go/tools v0.6.0
 )

go.sum

@@ -1278,8 +1278,8 @@ google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAG
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/grpc v1.69.4 h1:MF5TftSMkd8GLw/m0KM6V8CMOCY6NZ1NQDPGFgbTt4A=
 google.golang.org/grpc v1.69.4/go.mod h1:vyjdE6jLBI76dgpDojsFGNaHlxdjXN9ghpnd2o7JGZ4=
-google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.2.0 h1:TLkBREm4nIsEcexnCjgQd5GQWaHcqMzwQV0TX9pq8S0=
-google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.2.0/go.mod h1:DNq5QpG7LJqD2AamLZ7zvKE0DEpVl2BSEVjFycAAjRY=
+google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.3.0 h1:rNBFJjBCOgVr9pWD7rs/knKL4FRTKgpZmsRfV214zcA=
+google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.3.0/go.mod h1:Dk1tviKTvMCz5tvh7t+fh94dhmQVHuCt2OzJB3CTW9Y=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -1292,7 +1292,6 @@ google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGj
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
 google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=

internal/cloudplugin/cloudproto1/cloudproto1.pb.go

@@ -94,6 +94,16 @@ func main() {
 			filename := toFilenameCase(baseName) + ".go"
 			absFilename := filepath.Join(outDir, filename)
 
+			if regexp.MustCompile("^Unsafe").MatchString(ifaceName) {
+				// This isn't a gRPC server interface, so skip it.
+				//
+				// This is an interface that's intended to be embedded to help users to meet requirements for Unimplemented servers.
+				// See:
+				// > Docs: https://pkg.go.dev/google.golang.org/grpc/cmd/protoc-gen-go-grpc#readme-future-proofing-services
+				// > PR for Unsafe interfaces: https://github.com/grpc/grpc-go/pull/3911
+				continue Types
+			}
+
 			var buf bytes.Buffer
 
 			fmt.Fprintf(&buf, `// Copyright (c) HashiCorp, Inc.