Detect and report flaky tests

[michalvavrik]

Summary

Flaky tests from SureFire and FailSafe reports are aggregated by a Maven extension added in this PR. The flaky report can be used in Jenkins or in GitHub Actions. Here on GitHub when PR contains flaky tests, we add triage/flaky-test label and comment which job contained flaky tests so that someone can inspect artifacts with actual test names.

Please check the relevant options

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Dependency update
• Refactoring
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• This change requires execution against OCP (use run tests phrase in comment)

Checklist:

• Example scenarios has been updated / added
• Methods and classes used in PR scenarios are meaningful
• Commits are well encapsulated and follow the best practices