Support Laravel 12.x & PHP 8.4

[SRWieZ]

Replaces #165

• Support Laravel 12 & PHP 8.4
• Refactored to group feature and unit tests separately, so we can work on E2E tests separately
  • Added MacOS to unit tests
  • Isolated BootingTest into his own workflow

More details in the comment below.

Depends on:

• Support Laravel 12.x & PHP 8.4 laravel#494

[SRWieZ]

I took this opportunity to try to fix the test suite, but I didn't really succeed.

• It still fails on Ubuntu, I believe since GitHub Actions updated Ubuntu 24.04.
• It seems to fail on prefer-lowest in L11 and L12.

The BootingTest is a bit blurry, we don't have any information on why it fails.That's why I isolated it into another workflow for now. It's still running but in ideal conditions. I intend to look at this in a separate PR.

At least now we have 74 ✅ PHP tests workflows.

Of course, there is still the plugin test failing that I will fix next in #154.