Use antithesis's random

[nwnt]

Fixes #21720

Instead of rolling my own implementation, I'm making everything that uses math/rand become something like the following:

   // original
   num := rand.Intn()
   // patched
   num := rand.New(antithesisRand.Source()).Intn()

which should satisfy the requirements described here.

The patch is a bit large because I did not want to write a small program or script to patch everything on the fly just yet as there are a lot of different usages of math/rand. That might be something to do in the future once we have proven that this work. The files and usages are looked up by the following command:

rg -l math/rand | grep -v _test.go | sort

cc @serathius @marcus-hodgson-antithesis @henrybear327

[kubernetes-prow]

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[nwnt]

This move is needed because otherwise the patch would run into an error. Basically we just need to sed after the patch.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.61%. Comparing base (b9ba05c) to head (b6c66dc).

Additional details and impacted files

see 17 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21989      +/-   ##
==========================================
- Coverage   69.66%   69.61%   -0.05%     
==========================================
  Files         449      449              
  Lines       38177    38177              
==========================================
- Hits        26596    26577      -19     
- Misses      10149    10167      +18     
- Partials     1432     1433       +1     

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[serathius]

We don't want a large patch, can we just run sed to replace math/rand import with antithesis one? Are there incompatible differences that prevent us from doing so?

[nwnt]

We can't actually do that willy-nilly as Antithesis's random package is not a drop-in replacement of Go's math/random.

Let me think if there's a way to do so, but that might involve a script, which I can try to make it small.

[kubernetes-prow]

@nwnt: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-verify	b6c66dc	link	true	/test pull-etcd-verify
pull-etcd-coverage-report	b6c66dc	link	true	/test pull-etcd-coverage-report

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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