tests: fix some python and test syntax

[mjstapp]

Fix a couple of python escape syntax warnings, and an unknown pytest mark - was seeing these reported in recent CI runs.

[greptile-apps]

Greptile Summary

Fixes Python syntax warnings in test files by correcting escape sequences and replacing an unregistered pytest mark.

• Removes unnecessary backslash escapes in BGP extended community regex pattern (test_bgp_extcomm-list_delete.py)
• Fixes backslash escaping in docstring ASCII diagram (test_wucmp_use_underlay.py)
• Replaces pytest.mark.random_order(disabled=True) with pytest.mark.zebra (test_zebra_multiple_connected.py)

Note: The zebra marker is not currently registered in pytest.ini, which will still generate an "unknown mark" warning.

Confidence Score: 4/5

• Safe to merge with one minor follow-up needed
• Changes correctly fix Python syntax warnings. The regex pattern change should be verified through tests to ensure BGP extended community matching still works as expected. The zebra marker needs to be registered in pytest.ini to fully resolve warnings.
• tests/topotests/zebra_multiple_connected/test_zebra_multiple_connected.py - requires zebra marker registration in pytest.ini

Important Files Changed

Filename	Overview
tests/topotests/bgp_extcomm_list_delete/test_bgp_extcomm-list_delete.py	Removes unnecessary backslash escapes from regex pattern to fix Python deprecation warnings
tests/topotests/wucmp_bgp_diamond/test_wucmp_use_underlay.py	Fixes backslash escaping in docstring ASCII art to eliminate Python syntax warnings
tests/topotests/zebra_multiple_connected/test_zebra_multiple_connected.py	Replaces unknown random_order pytest mark with valid zebra mark

_{Last reviewed commit: 09cc79f}

[greptile-apps]

_{3 files reviewed, 1 comment}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

zebra marker is not registered in tests/topotests/pytest.ini. Add zebra: Tests that run against ZEBRA to the markers list (around line 63) to prevent warnings about unknown marks

Prompt To Fix With AI

This is a comment left during a code review.
Path: tests/topotests/zebra_multiple_connected/test_zebra_multiple_connected.py
Line: 24

Comment:
`zebra` marker is not registered in `tests/topotests/pytest.ini`. Add `zebra: Tests that run against ZEBRA` to the markers list (around line 63) to prevent warnings about unknown marks

How can I resolve this? If you propose a fix, please make it concise.

[mjstapp]

oof - quite right, no zebra test mark; removed it

[Jafaral]

@Mergifyio backport dev/10.6

[mergify]

backport dev/10.6

✅ Backports have been created

Details

• #20915 tests: fix some python and test syntax (backport #20905) has been created for branch dev/10.6