controller: remove controller/errdefs protobuf files

Remove the protobuf files associated with controller/errdefs.

This doesn't completely remove the type as the monitor still uses it as
a signal to start the monitor.

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

controller/errdefs/build.go

@@ -1,48 +1,20 @@
 package errdefs
 
-import (
-	"io"
-
-	"github.com/containerd/typeurl/v2"
-	"github.com/docker/buildx/util/desktop"
-	"github.com/moby/buildkit/util/grpcerrors"
-)
-
-func init() {
-	typeurl.Register((*Build)(nil), "github.com/docker/buildx", "errdefs.Build+json")
-}
-
 type BuildError struct {
-	*Build
-	error
+	err error
 }
 
 func (e *BuildError) Unwrap() error {
-	return e.error
+	return e.err
 }
 
-func (e *BuildError) ToProto() grpcerrors.TypedErrorProto {
-	return e.Build
+func (e *BuildError) Error() string {
+	return e.err.Error()
 }
 
-func (e *BuildError) PrintBuildDetails(w io.Writer) error {
-	if e.Ref == "" {
-		return nil
-	}
-	ebr := &desktop.ErrorWithBuildRef{
-		Ref: e.Ref,
-		Err: e.error,
-	}
-	return ebr.Print(w)
-}
-
-func WrapBuild(err error, sessionID string, ref string) error {
+func WrapBuild(err error) error {
 	if err == nil {
 		return nil
 	}
-	return &BuildError{Build: &Build{SessionID: sessionID, Ref: ref}, error: err}
-}
-
-func (b *Build) WrapError(err error) error {
-	return &BuildError{error: err, Build: b}
+	return &BuildError{err: err}
 }