Add PHPStan on tests

[Tabrisrp]

Description

Extend our current PHPStan coverage (level 0) to the tests files

Documentation

User documentation

This extends the PHPStan action to tests files, so even there the PHP code quality can be checked and validated. In this PR it passed the same level 0 as the main files for now

No impact

Technical documentation

Type of change

• Enhancement (non-breaking change which improves an existing functionality).

Checklists

Code style

• I wrote self-explanatory code about what it does.
• I wrote comments to explain why it does it.
• I named variables and functions explicitely.
• I protected entry points against unexpected inputs.
• I did not introduce unecessary complexity.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 1b3b8a51	✅ ∅ (target: 50.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1b3b8a5)	Report Missing	Report Missing	Report Missing
Head commit (9fc9656)	37290	14481	38.83%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6733)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

See your quality gate settings    Change summary preferences

---

_{🚀 Don’t miss a bit, follow what’s new on Codacy.}

_{Codacy stopped sending the deprecated coverage status on June 5th, 2024. Learn more}

Footnotes

1. Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct. ↩