Prevent merging on outstanding fixup commits

[delthas]

Issue: PTFE-3031

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.11%. Comparing base (fcd08a5) to head (7fb96f5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
+ Coverage   89.03%   89.11%   +0.08%     
==========================================
  Files          75       75              
  Lines       10060    10134      +74     
==========================================
+ Hits         8957     9031      +74     
  Misses       1103     1103              

Flag	Coverage Δ
integration	87.59% <100.00%> (+0.11%)	⬆️
tests	87.55% <100.00%> (+0.11%)	⬆️
tests-BuildFailedTest	26.91% <18.91%> (-0.08%)	⬇️
tests-QuickTest	33.97% <18.91%> (-0.14%)	⬇️
tests-RepositoryTests	26.57% <18.91%> (-0.07%)	⬇️
tests-TaskQueueTests	51.72% <27.02%> (-0.23%)	⬇️
tests-TestBertE	66.42% <100.00%> (+0.30%)	⬆️
tests-TestQueueing	53.61% <27.02%> (-0.25%)	⬇️
tests-api-mock	16.08% <8.10%> (-0.06%)	⬇️
tests-noqueue	78.04% <100.00%> (+0.19%)	⬆️
tests-noqueue-BuildFailedTest	26.91% <18.91%> (-0.08%)	⬇️
tests-noqueue-QuickTest	33.97% <18.91%> (-0.14%)	⬇️
tests-noqueue-RepositoryTests	26.57% <18.91%> (-0.07%)	⬇️
tests-noqueue-TaskQueueTests	51.72% <27.02%> (-0.23%)	⬇️
tests-noqueue-TestBertE	62.84% <100.00%> (+0.35%)	⬆️
tests-noqueue-TestQueueing	26.59% <18.91%> (-0.07%)	⬇️
tests-server	29.52% <10.81%> (-0.14%)	⬇️
unittests	40.60% <10.81%> (-0.22%)	⬇️
utests	24.61% <10.81%> (-0.11%)	⬇️

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[delthas]

We will use GitHub checks (and perhaps enable bert-e to read those checks in a separate MR)