Improve test module detection on Mill 0.11.7+

[lefou]

This prepared mill-jacoco to better catch exactly the correct module sources. It especially detects any custom test module and excludes it's coverage data from the reports. Perviously, we only detected test modules by naming conventions, which was rather sloppy.

Fix #3

This feature only works when used with Mill 0.11.7 or newer. This is a soft requirement and will checked at runtime.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (dfc6c1b) 100.00% compared to head (0353273) 100.00%.

❗ Current head 0353273 differs from pull request most recent head 902b2a2. Consider uploading reports for the commit 902b2a2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #74   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           10        10           
=========================================
  Hits            10        10           

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