Enhancement: Extract SlowTestList

[localheinz]

This pull request

• extracts a SlowTestList

[codecov]

Codecov Report

Attention: Patch coverage is 85.91549% with 10 lines in your changes missing coverage. Please review.

Project coverage is 57.44%. Comparing base (cac46cd) to head (2a77834).

Files with missing lines	Patch %	Lines
src/Extension.php	0.00%	6 Missing ⚠️
src/SlowTestList.php	84.61%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #658      +/-   ##
============================================
+ Coverage     56.14%   57.44%   +1.30%     
- Complexity      117      127      +10     
============================================
  Files            28       30       +2     
  Lines           675      698      +23     
============================================
+ Hits            379      401      +22     
- Misses          296      297       +1     

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