[Bug]: Sharding in modular apps

What Happened

Right now, when tests are spread across modules in the app and not in the tests directory, while sharding, all the tests are running for each shard.

In here, the pattern only detects the tests that are starting with the Tests\ namespace
https://github.com/pestphp/pest/blob/a7b2039175926804e7f3b5c043e632644c5bc8ef/src/Plugins/Shard.php#L92
But when you change the line to

preg_match_all('/ - (?:P\\\\)?(.+)::/', $output, $matches);

It works, but the reason I did not submit a PR was that in this https://github.com/pestphp/pest/commit/5def62018b19b8a9fc6bdc410f6a48925a1b9d51 commit, you have changed the same thing, and because I didn't know the reason, I decided to submit an issue instead.

How to Reproduce

Put tests in any directory other than tests

Sample Repository

No response

Pest Version

4.0.0

PHP Version

8.3

Operation System

Linux, Windows

Notes

No response

Start in src/Plugins/Shard.php around line 92 and compare the current pattern with commit 5def62018b19b8a9fc6bdc410f6a48925a1b9d51 to understand why the namespace restriction was introduced. Reproduce the issue with tests outside the tests directory, then verify that sharding discovers those tests without breaking existing test discovery.