chore: update protobuf to reuse file request (#21447)

**This is just the protobuf changes for the PR https://github.com/coder/coder/pull/21398**

Moved `UploadFileRequest` from `provisionerd.proto` -> `provisioner.proto`.

Renamed to `FileUpload` because it is now bi-directional.

This **is backwards compatible**. I tested it to confirm the payloads are identical.  Types were just renamed and moved around.

```golang
func TestTypeUpgrade(t *testing.T) {
	t.Parallel()

	x := &proto2.UploadFileRequest{
		Type: &proto2.UploadFileRequest_ChunkPiece{
			ChunkPiece: &proto.ChunkPiece{
				Data:         []byte("Hello World!"),
				FullDataHash: []byte("Foobar"),
				PieceIndex:   42,
			},
		},
	}

	data, err := protobuf.Marshal(x)
	require.NoError(t, err)

	// Exactly the same output
	// EhgKDEhlbGxvIFdvcmxkIRIGRm9vYmFyGCo= on `main`
	// EhgKDEhlbGxvIFdvcmxkIRIGRm9vYmFyGCo= on this branch
	fmt.Println(base64.StdEncoding.EncodeToString(data))
}
```


# What this does

This allows provisioner daemons to download files from `coderd`'s `files` table. This is used to send over cached module files and prevent the need of downloading these modules on each workspace build.

coderd/provisionerdserver/provisionerdserver.go

@@ -1433,7 +1433,7 @@ UploadFileStream:
 		}
 
 		switch typed := msg.Type.(type) {
-		case *proto.UploadFileRequest_DataUpload:
+		case *sdkproto.FileUpload_DataUpload:
 			if file != nil {
 				return xerrors.New("unexpected file upload while waiting for file completion")
 			}
@@ -1453,7 +1453,7 @@ UploadFileStream:
 				// This should never really happen in practice, but we handle it gracefully.
 				break UploadFileStream
 			}
-		case *proto.UploadFileRequest_ChunkPiece:
+		case *sdkproto.FileUpload_ChunkPiece:
 			if file == nil {
 				return xerrors.New("unexpected chunk piece while waiting for file upload")
 			}
@@ -1518,6 +1518,11 @@ UploadFileStream:
 	return nil
 }
 
+func (*server) DownloadFile(_ *proto.FileRequest, _ proto.DRPCProvisionerDaemon_DownloadFileStream) error {
+	// TODO implemented in follow up PR
+	panic("implement me")
+}
+
 // CompleteJob is triggered by a provision daemon to mark a provisioner job as completed.
 func (s *server) CompleteJob(ctx context.Context, completed *proto.CompletedJob) (*proto.Empty, error) {
 	ctx, span := s.startTrace(ctx, tracing.FuncName())

coderd/provisionerdserver/upload_file_test.go

@@ -110,10 +110,10 @@ func TestUploadFileErrorScenarios(t *testing.T) {
 
 		stream := &mockUploadStream{
 			done:     make(chan struct{}),
-			messages: make(chan *proto.UploadFileRequest, 2),
+			messages: make(chan *sdkproto.FileUpload, 2),
 		}
 
-		up := &proto.UploadFileRequest{Type: &proto.UploadFileRequest_DataUpload{DataUpload: upload}}
+		up := &sdkproto.FileUpload{Type: &sdkproto.FileUpload_DataUpload{DataUpload: upload}}
 
 		// Send it twice
 		stream.messages <- up
@@ -140,7 +140,7 @@ func TestUploadFileErrorScenarios(t *testing.T) {
 
 type mockUploadStream struct {
 	done     chan struct{}
-	messages chan *proto.UploadFileRequest
+	messages chan *sdkproto.FileUpload
 }
 
 func (m mockUploadStream) SendAndClose(empty *proto.Empty) error {
@@ -148,7 +148,7 @@ func (m mockUploadStream) SendAndClose(empty *proto.Empty) error {
 	return nil
 }
 
-func (m mockUploadStream) Recv() (*proto.UploadFileRequest, error) {
+func (m mockUploadStream) Recv() (*sdkproto.FileUpload, error) {
 	msg, ok := <-m.messages
 	if !ok {
 		return nil, xerrors.New("no more messages to receive")
@@ -177,14 +177,14 @@ func (m *mockUploadStream) isDone() bool {
 func newMockUploadStream(up *sdkproto.DataUpload, chunks ...*sdkproto.ChunkPiece) *mockUploadStream {
 	stream := &mockUploadStream{
 		done:     make(chan struct{}),
-		messages: make(chan *proto.UploadFileRequest, 1+len(chunks)),
+		messages: make(chan *sdkproto.FileUpload, 1+len(chunks)),
 	}
 	if up != nil {
-		stream.messages <- &proto.UploadFileRequest{Type: &proto.UploadFileRequest_DataUpload{DataUpload: up}}
+		stream.messages <- &sdkproto.FileUpload{Type: &sdkproto.FileUpload_DataUpload{DataUpload: up}}
 	}
 
 	for _, chunk := range chunks {
-		stream.messages <- &proto.UploadFileRequest{Type: &proto.UploadFileRequest_ChunkPiece{ChunkPiece: chunk}}
+		stream.messages <- &sdkproto.FileUpload{Type: &sdkproto.FileUpload_ChunkPiece{ChunkPiece: chunk}}
 	}
 	close(stream.messages)
 	return stream