[JUnit Platform] Use EngineDiscoveryRequestResolver

[mpkorstanje]

🤔 What's changed?

⚡️ What's your motivation?

Fully utilize the EngineDiscoveryRequestResolver API to reduce our own complexity (junit-team/junit5#3705, junit-team/junit5#3718)

🏷️ What kind of change is this?

• 🏦 Refactoring/debt/DX (improvement to code design, tooling, documentation etc. without changing behaviour)

♻️ Anything particular you want feedback on?

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• I've changed the behaviour of the code
  • I have added/updated tests to cover my changes.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

[codecov]

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (a6b13a3) 84.99% compared to head (b6ab3cb) 84.86%.

❗ Current head b6ab3cb differs from pull request most recent head b78dac7. Consider uploading reports for the commit b78dac7 to get more accurate results

Files	Patch %	Lines
...it/platform/engine/CucumberDiscoverySelectors.java	81.25%	9 Missing and 3 partials ⚠️
...ucumber/junit/platform/engine/FeatureResolver.java	95.65%	2 Missing and 3 partials ⚠️
...junit/platform/engine/PackageFilteringVisitor.java	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2835      +/-   ##
============================================
- Coverage     84.99%   84.86%   -0.13%     
+ Complexity     2733     2719      -14     
============================================
  Files           331      334       +3     
  Lines          9557     9569      +12     
  Branches        918      932      +14     
============================================
- Hits           8123     8121       -2     
- Misses         1109     1118       +9     
- Partials        325      330       +5     

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[mpkorstanje]

The current implementation of the JUnit Platform Engine treats @SelectClasspathResource aimed at directories as if all resources in that directory should be considered. This is not the intended usage, for this @SelectPackages should be used.

Cucumbers documentation consistently uses @SelectClasspathResource.

This will become a problem if/when we start to use the EngineDiscoveryRequestResolver with (#2835, junit-team/junit5#3705, junit-team/junit5#3718) because @SelectClasspathResource will cause an exception to be thrown when used with a non-existing resource.