Invoke "BrowserTestCase::onTestSuiteEnded" method only for executed tests

[aik099]

The BrowserTestCase::onTestSuiteEnded event was also invoked for excluded tests. This happened because tests for iteration were retrieved from the TestSuite::tests method (which returns all tests and even those, that won't be executed).

Instead, interaction should be made through the TestSuite class object itself (as PHPUnit does). This has been fixed by this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.58%. Comparing base (fe5911c) to head (1c7a6e2).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #130      +/-   ##
============================================
- Coverage     86.27%   82.58%   -3.70%     
  Complexity      330      330              
============================================
  Files            30       30              
  Lines           867      867              
============================================
- Hits            748      716      -32     
- Misses          119      151      +32     

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