devonfw/ide-urls#17: fix UrlUpdater to auto-remove broken URLs and allow self-repair

[hohwille]

fixes devonfw/ide-urls#17

or at least tries to fix the problem. Releases that are gone cannot come back but they will now be deleted if 404 have been detected for 14+ days.
If no valid URL remains for a version the entire version will be gone.
Therefore it will be recreated if it still exists (e.g. on different mirror).

I found and fixed many evil bugs and spent a long time debugging this mess...

[hohwille]

Tests still failing:

[ERROR] Failures:
[ERROR] UrlUpdaterReportTest.testReportAfterVersionForOsRemoved:104
expected: mocked/mocked:addVersionSuccess=1, addVersionFailure=0, verificationSuccess=7, verificationFailure=8
but was: mocked/mocked:addVersionSuccess=1, addVersionFailure=0, verificationSuccess=2, verificationFailure=2
[ERROR] UrlUpdaterReportTest.testReportAfterVersionsForRemovedAndReversedUrlResponses:143
expected: mocked/mocked:addVersionSuccess=1, addVersionFailure=0, verificationSuccess=6, verificationFailure=6
but was: mocked/mocked:addVersionSuccess=1, addVersionFailure=0, verificationSuccess=2, verificationFailure=2
[ERROR] UrlUpdaterReportTest.testReportWithExistVersionsAndFailedDownloads:75
expected: mocked/mocked:addVersionSuccess=0, addVersionFailure=0, verificationSuccess=6, verificationFailure=6
but was: mocked/mocked:addVersionSuccess=0, addVersionFailure=0, verificationSuccess=0, verificationFailure=0
[INFO]
[ERROR] Tests run: 355, Failures: 3, Errors: 0, Skipped: 0

[jan-vcapgemini]

Thank you for your bugfixes. We've added some change requests and questions.
Co-Reviewed by: @alfeilex, @fahamzaoui

[hohwille]

Thank you for your bugfixes. We've added some change requests and questions.

I reworked that already and IMHO all review feedback is addressed.
Did you test this already?
Do you have any hint how to proceed with the failing test? Is there a bug or is the test incorrect?

I would like to see what happens after we merged this and the UrlUpdater action ran again... Will this fix our problems or not.

[fahamzaoui]

found an issue with npe please fix.