Use robustness traffic generation

[nwnt]

Fix #19839

This currently includes exporting etcdTraffic so it can be reused by the antithesis robustness tests.

[k8s-ci-robot]

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[serathius]

Looks good, nice work.

Left couple of comments just nits.

[nwnt]

@serathius thank you for the review comments, they should have all been fixed. it's ready for another review :)

[serathius]

/ok-to-test

[serathius]

Applied some small patches to minimize back and forth due to timezones. Some changes:

• baseTime also needs to be reused between clients
• we should avoid global variables other than configuration
• we shouldn't use generic functions if not needed. wrap is an overkill for one case where we need to wait some time and close channel.
• Making all fields in traffic was too much, we just need a separate traffic shape.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.82%. Comparing base (eae9a91) to head (3860239).
Report is 3 commits behind head on main.

Additional details and impacted files

see 159 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19852      +/-   ##
==========================================
- Coverage   68.64%   61.82%   -6.83%     
==========================================
  Files         424      409      -15     
  Lines       35862    34637    -1225     
==========================================
- Hits        24619    21413    -3206     
- Misses       9808    11647    +1839     
- Partials     1435     1577     +142     

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nwnt, serathius

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