nose: T7825: Use nose2 for unit tests

[sarthurdev]

Change summary

Replace docker nose package with python3-nose2

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

Related PR(s)

• nose: T7825: Use nose2 for unit tests vyos-1x#4728

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

[github-actions]

👍
No issues in PR Title / Commit Title

[sever-sever]

Use python3-nose2 instead of python3-nose

[dmbaturin]

python3-nose is no longer shipped in Debian Trixie. python3-nose2 is backward-compatible and does exist in Debian Bookworm already, so I think we should indeed update to it to make our life simpler in the future.