Feature Request: Add test integration phan

[muhme]

Current Behavior: Currently, 7 out of the 9 Drone-like tests are implemented: php-cs-fixer, phpcs, unit, lint:css, lint:js, lint:testjs, and system. The remaining tests, phan and integration, are not yet included.

Proposed Feature: To enhance the test suite, it would be beneficial to implement the missing PHP Unit Integration Test Suite integration and the static analyzer for PHP phan. This gives the ability to run the whole test suite on your own before Drone.

Feature Ideas:

• Add the new tests to the default list. If no test name is given, run all tests, including the new ones.
• Extend and adopt the documentation Drone-like tests and the help screen.

# Run new Drone-like tests on all branches
scripts/test integration phan

Please vote with 👍 if you would like to see this feature implemented, or feel free to contribute if you're interested!