refactor(output): share the JSON, created-resource and batch tails

Mutations end with a.jsonResult or a.created instead of hand-rolled
--json branches, the two identical jsonResult/writeMutationJSON helpers
become one, and writeBatchJSON checks --json itself so batch commands
share one tail.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/comments.go

@@ -142,11 +142,8 @@ func (a *application) commentOn(cmd *cobra.Command, t target, n int64, kind refK
 	if err != nil {
 		return err
 	}
-	if a.options.json != "" {
-		return a.writeJSON(cmd, comment)
-	}
 	a.done(cmd, "Commented on %s", refLabel(t.Repo, n, item.Title))
-	return a.printURL(cmd, comment.URL)
+	return a.created(cmd, comment, comment.URL)
 }
 
 // lastComment returns the newest comment on n by the account tea acts as.
@@ -185,11 +182,8 @@ func (a *application) editComment(cmd *cobra.Command, t target, comment services
 		return err
 	}
 	edited.IssueNumber = comment.IssueNumber
-	if a.options.json != "" {
-		return a.writeJSON(cmd, edited)
-	}
 	a.done(cmd, "Edited %s", commentName(t, edited))
-	return nil
+	return a.jsonResult(cmd, edited)
 }
 
 // deleteComment deletes comment after a confirmation that defaults to no.