docs(contributing): document how to install stress tool

[ghouscht]

Fixes #18650. I think this is all what was missing for me, should also be enough for others to help fix flaky tests.

[k8s-ci-robot]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.80%. Comparing base (68e7122) to head (d700f3c).
Report is 4 commits behind head on main.

❗ Current head d700f3c differs from pull request most recent head bea695d

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Additional details and impacted files

see 25 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #18651      +/-   ##
==========================================
+ Coverage   68.77%   68.80%   +0.02%     
==========================================
  Files         420      420              
  Lines       35535    35535              
==========================================
+ Hits        24440    24450      +10     
+ Misses       9660     9658       -2     
+ Partials     1435     1427       -8     

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[ivanvc]

Thanks for your pull request, @ghouscht. This is looking great, I left two suggestions ✌️

[ivanvc]

Thanks, @ghouscht. It looks good. Can you please squash your commits?

Thanks again.

[ghouscht]

Thanks, @ghouscht. It looks good. Can you please squash your commits?

Thanks again.

Sorry forgot about that but it is done now.

[ivanvc]

/retest

[ivanvc]

/ok-to-test

[ivanvc]

LGTM. Thanks, Thomas.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, ghouscht, ivanvc

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