Add a mock Qubes object with improved contents

[marmarta]

Also several convenience methods and pre-populated Qubes setups.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e789256) 75.07% compared to head (2300137) 75.03%.
Report is 3 commits behind head on main.

❗ Current head 2300137 differs from pull request most recent head 651c9c2. Consider uploading reports for the commit 651c9c2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #267      +/-   ##
==========================================
- Coverage   75.07%   75.03%   -0.04%     
==========================================
  Files          51       51              
  Lines        7815     7815              
==========================================
- Hits         5867     5864       -3     
- Misses       1948     1951       +3     

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[marmarta]

PipelineRetryFailed

[marmarek]

That's the other way around: here rw=False, and otherwise rw=True.