pam/integration-tests/ssh: Some tests cleanups and enforcements

[3v1n0]

See commits for details.

Base of #971

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 85.61%. Comparing base (bbbb672) to head (6c6887b). Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #979   +/-   ##
=======================================
  Coverage   85.61%   85.61%           
=======================================
  Files          82       82           
  Lines        5792     5792           
  Branches      111      111           
=======================================
  Hits         4959     4959           
  Misses        777      777           
  Partials       56       56           

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