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/repository_sync.go

@@ -91,11 +91,8 @@ $ tea repo sync bob/project`,
 			if err != nil {
 				return err
 			}
-			if a.options.json != "" {
-				return a.writeJSON(cmd, result)
-			}
 			a.reportSync(cmd, result, remote+"/"+result.Branch)
-			return nil
+			return a.jsonResult(cmd, result)
 		},
 	}
 	command.Flags().StringVarP(&branch, "branch", "b", "", "Branch to sync (default: the repository's default branch)")
@@ -118,7 +115,7 @@ func (a *application) syncOnServer(cmd *cobra.Command, t target, branch string)
 			return err
 		}
 		a.done(cmd, "Started updating the mirror %s from its source", item.FullName)
-		return a.writeMutationJSON(cmd, git.SyncResult{Remote: mirrorSourceURL(item)})
+		return a.jsonResult(cmd, git.SyncResult{Remote: mirrorSourceURL(item)})
 	case !item.Fork || item.Parent == nil:
 		return clierr.Wrap(clierr.Usage, fmt.Errorf("%s is neither a fork nor a mirror, and has no Git remote here; run tea repo sync inside a clone of it", item.FullName))
 	}
@@ -141,7 +138,7 @@ func (a *application) syncOnServer(cmd *cobra.Command, t target, branch string)
 	} else {
 		a.done(cmd, "Synced %s %s from %s (fast-forward %s..%s)", item.FullName, branch, item.Parent.FullName, shortSHA(result.Previous), shortSHA(result.Commit))
 	}
-	return a.writeMutationJSON(cmd, result)
+	return a.jsonResult(cmd, result)
 }
 
 // reportSync tells how a sync from source, such as origin/main, changed the branch.