PTFE-1621 stronger healthcheck against leaks of runner

[tcarmet]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 67.74194% with 10 lines in your changes are missing coverage. Please review.

Project coverage is 86.11%. Comparing base (c0fa117) to head (e68b39f).
Report is 3 commits behind head on main.

Files	Patch %	Lines
runner_manager/backend/aws.py	25.00%	6 Missing ⚠️
runner_manager/backend/gcloud.py	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #582      +/-   ##
==========================================
+ Coverage   85.86%   86.11%   +0.24%     
==========================================
  Files          31       31              
  Lines        1224     1246      +22     
==========================================
+ Hits         1051     1073      +22     
  Misses        173      173              

Flag	Coverage Δ
api	66.69% <38.70%> (-0.14%)	⬇️
unit	71.42% <67.74%> (+0.51%)	⬆️

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