[wip] switch to stern for log collection. Also tar.gz the file

[dprotaso]

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[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.06%. Comparing base (54868c2) to head (fad132e).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16167      +/-   ##
==========================================
- Coverage   80.08%   80.06%   -0.02%     
==========================================
  Files         214      214              
  Lines       16940    16940              
==========================================
- Hits        13566    13563       -3     
- Misses       3015     3019       +4     
+ Partials      359      358       -1     

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[knative-prow]

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

Test name	Commit	Details	Required	Rerun command
istio-latest-no-mesh_serving_main	2b7cbe6	link	true	/test istio-latest-no-mesh

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