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/teams.go

@@ -380,10 +380,7 @@ $ tea team create acme ops --permission admin --all-repositories`,
 				return err
 			}
 			a.done(cmd, "Created team %s (ID %d) with %s access", team.Slug(), team.ID, team.Access())
-			if err := a.printURL(cmd, teamURL(target, team)); err != nil {
-				return err
-			}
-			return a.jsonResult(cmd, team)
+			return a.created(cmd, team, teamURL(target, team))
 		},
 	}
 	flags.register(cmd, true)