Remove enumvalue_customname, goproto_enum_prefix and enum_customname

This commit removes gogoproto.enumvalue_customname,
gogoproto.goproto_enum_prefix and gogoproto.enum_customname.

All of them make proto-generated Go code more idiomatic, but we already
don't use these enums in our external-surfacing types and they are anyway
not supported by Google's official toolchain (see #6564).

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

runtime/v1/linux/task.go

@@ -27,7 +27,6 @@ import (
 
 	"github.com/containerd/cgroups"
 	eventstypes "github.com/containerd/containerd/api/events"
-	"github.com/containerd/containerd/api/types/task"
 	"github.com/containerd/containerd/errdefs"
 	"github.com/containerd/containerd/events/exchange"
 	"github.com/containerd/containerd/identifiers"
@@ -166,22 +165,9 @@ func (t *Task) State(ctx context.Context) (runtime.State, error) {
 		}
 		return runtime.State{}, errdefs.ErrNotFound
 	}
-	var status runtime.Status
-	switch response.Status {
-	case task.StatusCreated:
-		status = runtime.CreatedStatus
-	case task.StatusRunning:
-		status = runtime.RunningStatus
-	case task.StatusStopped:
-		status = runtime.StoppedStatus
-	case task.StatusPaused:
-		status = runtime.PausedStatus
-	case task.StatusPausing:
-		status = runtime.PausingStatus
-	}
 	return runtime.State{
 		Pid:        response.Pid,
-		Status:     status,
+		Status:     statusFromProto(response.Status),
 		Stdin:      response.Stdin,
 		Stdout:     response.Stdout,
 		Stderr:     response.Stderr,