Many RouteBuilder::setRebuildNeeded() calls only occur when using the UI, not when using the configuration system

Problem/Motivation

Certain configuration changes need to trigger route rebuilds. But if those configuration changes are made through config deployment, they usually don't work.

Current calls to setRebuildNeeded() are in:

1. \Drupal\Core\Extension\ThemeInstaller::resetSystem()
2. \content_translation_form_language_content_settings_submit()
3. \content_translation_language_configuration_element_submit()
4. \field_ui_entity_bundle_create()
5. \field_ui_entity_view_mode_presave()
6. \field_ui_entity_form_mode_presave()
7. \field_ui_entity_view_mode_delete()
8. \field_ui_entity_form_mode_delete()
9. \node_form_system_themes_admin_form_submit()
10. \Drupal\search\Entity\SearchPage::postSave()
11. \Drupal\system\SystemConfigSubscriber::onConfigSave()
12. \views_invalidate_cache()
13. \views_view_delete()
14. \Drupal\views\Entity\View::postSave()

Only one of them (number 11) is in a ConfigEvents::SAVE event subscriber. This one is fine. Because it will work for both changes made through the UI and config deployments. This one is okay.

The calls made from config entities' post-save or post-delete methods are also okay. They are numbers 10 and 14. These are also okay.

Proposed resolution

TBD, see remaining tasks for now.

Remaining tasks

1. Review all of these calls. Probably convert them to ConfigEvents::SAVE subscribers.
2. Document the consequences of calling setRebuildNeeded(). This may trigger additional insights for this issue.
3. TBD!

User interface changes

None, except that config deployments will now also cause the necessary route rebuilds!

API changes

TBD, likely none.

Data model changes

None.