Remove unittest's deprecated getTestCaseNames, makeSuite, findTestCases

[hugovk]

Feature or enhancement

Prior to Python 3.11, unittest's getTestCaseNames, makeSuite and findTestCases were commented:

these functions should be considered obsolete

They were deprecated with warnings in 3.11 and scheduled for removal in 3.13.

Previous discussion

• Deprecate obsolete functions in unittest #50096

Linked PRs

• gh-104835: Remove unittest's deprecated getTestCaseNames, makeSuite, findTestCases #104836