Remove deprecated unittest.TestProgram.usageExit

[hugovk]

Feature or enhancement

The unittest.TestProgram.usageExit method was deprecated in Python 3.11 and scheduled for removal in 3.13.

The method wasn't documented. The deprecation was documented in the changelog but not in What's New.

In addition to removal in 3.13, I suggest adding it to the "What's New in 3.11" > Deprecations:

• https://docs.python.org/3.13/whatsnew/3.11.html#deprecated

And to "What's New in 3.12" > "Pending Removal in Python 3.13":

• https://docs.python.org/3.13/whatsnew/3.12.html#pending-removal-in-python-3-13

Previous discussion

• unittest.TestProgram.usageExit no longer invoked #67048

Linked PRs

• gh-104992: Remove deprecated unittest.TestProgram.usageExit #104993
• gh-104992: [What's New in 3.11] Document unittest.TestProgram.usageExit's deprecation #104994
• gh-104992: [What's New in 3.12] Document unittest.TestProgram.usageExit's deprecation #104995
• [3.12] gh-104992: [What's New in 3.11] Document unittest.TestProgram.usageExit's deprecation (GH-104994) #105009
• [3.11] gh-104992: [What's New in 3.11] Document unittest.TestProgram.usageExit's deprecation (GH-104994) #105010
• [3.12] gh-104992: [What's New in 3.12] Document unittest.TestProgram.usageExit's deprecation (GH-104995) #105036