Add reload_on_trigger_change

### Description

Using the quickstart setup, for plugin changes there exists `reload_on_plugin_change = True` which when True causes the workers to restart on a change to the code in plugins.

For triggers there is no similar option and workers are not automatically restarted on a change to triggers in plugins.

### Use case/motivation

Add equivalent functionality for triggers to that which exists for plugins, where related workers are restarted so that trigger changes are picked up.

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)

Start by locating the quickstart configuration and existing reload_on_plugin_change handling, then trace how worker restarts are triggered for plugin changes. Compare that path with trigger changes and identify the related workers that should restart. Done means trigger changes in plugins cause equivalent worker reload behavior.

Written by the indexing model from the issue text.