feat: Removed xdebug from normal PHP 8.4 and 8.5 containers, bumped xebug versions to latest patch release

[chris-snyder-totara]

Description

Removes xdebug extension install from normal php-8.4 and php-8.5 containers, and switches dependency around so that php-debug containers depend on standard php containers, rather than vice versa.

Also bumps xdebug version to latest patch releases:

php8.4-debug to xdebug-3.4.7 (to fix segfault issues)
php8.5-debug to xdebug-3.5.1 (to fix Windows performance)

Testing Instructions

1. Check out this pull request
2. Rebuild php-8.4 and php-8.4-debug containers
3. tup php-8.4
4. Confirm that php-8.4-debug does NOT start at the same time
5. Test using tzsh php-8.4:
6. Confirm that php -i does not list any xdebug settings
7. Confirm that the unit test server/totara/notification/tests/webapi_toggle_notifiable_event_v2_test.php passes without segfault
8. tup php-8.4-debug
9. Test using tzsh php-8.4-debug:
10. Confirm that php -i shows xdebug configured and enabled
11. Confirm that the unit test server/totara/notification/tests/webapi_toggle_notifiable_event_v2_test.php passes without segfault

Checklist

• Does what the author says it will do
• Testing instructions are provided
• Commit messages make sense and follow the conventional commit standard
• No identified security issues
• No identified maintenance issues
• Any third-party libraries/dependencies use the MIT or Apache 2.0 license
• Changes made are backwards compatible and will not break existing setups
• Changes to scripts in the bin/ directory run correctly on both MacOS and WSL
• Changes to containers can be built locally sucessfully (e.g. via tbuild container && tup container)
• Containers/images are compatible with both AMD64 (Windows) and ARM64 (MacOS)
• Changes made to config.php are compatible with our oldest supported Totara version, our newest Totara version, and Moodle

[chris-snyder-totara]

New PR with proper branch name for issue.