Remove Test\AssertionFailed and Test\AssertionSucceeded events

[sebastianbergmann]

When we introduced the event system with PHPUnit 10, we thought it would be nice to emit events, Test\AssertionFailed and Test\AssertionSucceeded, after an assertion is performed.

While PHPUnit itself does not need these events, it does not subscribe to them itself, they have been a constant source of problems: #5183, #5184, #5261, #5510, #5515, #5524, #5539.

The workarounds that were implemented do not seem to always yield the desired effect and, moreover, make the event system's implementation more complicated than it should be.

I therefore propose to remove these events ASAP, in PHPUnit 11. As far as I know, none of the widely used extensions for PHPUnit subscribe to these events, so this removal should not be a problem.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (6efa643) 88.52% compared to head (1a59978) 88.46%.

Files	Patch %	Lines
src/Event/Facade.php	0.00%	1 Missing ⚠️
src/Framework/Constraint/Constraint.php	50.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5604      +/-   ##
============================================
- Coverage     88.52%   88.46%   -0.07%     
+ Complexity     6293     6258      -35     
============================================
  Files           671      668       -3     
  Lines         20170    20047     -123     
============================================
- Hits          17855    17734     -121     
+ Misses         2315     2313       -2     

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