Add ControlMaster/ControlPersist/ControlPath to Mila cluster SSH config entries

[Copilot]

• Add **ssh_multiplexing_config to all four mila SSH entries in MILA_ENTRIES
• Update test snapshot files for the new ControlMaster/ControlPath/ControlPersist fields
• Fix test_fixes_overly_general_cn_entry to be Windows-compatible: the expected dict only includes control multiplexing keys on non-Windows platforms (since ssh_multiplexing_config is {} on Windows)

Original prompt

add the ControlMaster/ControlPersist/ControlParh ssh config options for the mila cluster login and compute nodes, not just for the DRAC clusters.

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[lebrice]

@copilot some tests are failing on windows. Can you try to correct the tests, or add a pytest.xfail(sys.platform == "win32") mark (or similar) to the failing tests?

[Copilot]

@copilot some tests are failing on windows. Can you try to correct the tests, or add a pytest.xfail(sys.platform == "win32") mark (or similar) to the failing tests?

Fixed in 6241e51. The issue was that test_fixes_overly_general_cn_entry expected controlmaster/controlpath/controlpersist keys unconditionally, but on Windows ssh_multiplexing_config is an empty dict so those keys aren't added. The test now only includes those keys in the expected dict when not running on Windows.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.93%. Comparing base (8573991) to head (760c8f3).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #184      +/-   ##
==========================================
- Coverage   68.97%   68.93%   -0.04%     
==========================================
  Files          17       17              
  Lines        2540     2540              
==========================================
- Hits         1752     1751       -1     
- Misses        788      789       +1     

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