Refactor pprof labels and process desc (#32909)

* Deprecate "gopid" in log, it is not useful and requires very hacky
approach
* Remove "git.Command.SetDescription" because it is not useful and only
makes the logs too flexible

services/gitdiff/gitdiff.go

@@ -1156,7 +1156,6 @@ func GetDiff(ctx context.Context, gitRepo *git.Repository, opts *DiffOptions, fi
 
 	go func() {
 		stderr := &bytes.Buffer{}
-		cmdDiff.SetDescription(fmt.Sprintf("GetDiffRange [repo_path: %s]", repoPath))
 		if err := cmdDiff.Run(&git.RunOpts{
 			Timeout: time.Duration(setting.Git.Timeout.Default) * time.Second,
 			Dir:     repoPath,