Updates the Xdebug configuration in the local Docker environment to better support Windows (WSL2) users while maintaining stability for macOS and Linux.
* Enables `xdebug.discover_client_host` to allow Xdebug to automatically connect back to the IP address listed in the HTTP request headers, ensuring the debugger works reliably regardless of specific network topology.
* Sets `xdebug.client_host` to `host.docker.internal` as a fallback for `xdebug.discover_client_host`. In WSL2 networking, `localhost` resolves to the container itself rather than the host machine, preventing the debugger from connecting to the IDE; `host.docker.internal` correctly routes to the host machine across platforms.
Follow-up to [60060].
Props SirLouen, jdeep, westonruter.
See #49953.
Fixes#63979.
Built from https://develop.svn.wordpress.org/trunk@61461
git-svn-id: http://core.svn.wordpress.org/trunk@60773 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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