Enhancement: Use TimeKeeper instead of SlowTestCollector in Subscriber\TestPreparedSubscriber

[localheinz]

This pull request

• uses the TimeKeeper instead of the SlowTestCollector in the Subscriber\TestPreparedSubscriber

[codecov]

Codecov Report

Merging #25 (dd5672d) into main (2289f1a) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main       #25   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        38        38           
===========================================
  Files             10        10           
  Lines            140       141    +1     
===========================================
+ Hits             140       141    +1     

Impacted Files	Coverage Δ	Complexity Δ
src/Subscriber/TestPreparedSubscriber.php	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
src/SlowTestCollector.php	100.00% <0.00%> (ø)	6.00% <0.00%> (ø%)

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