drop special logic when handling kubelet probe header for istio mTLS

[izabelacg]

Changes

• Deprecates k-kubelet-probe header

Part of knative/serving#14981

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.70%. Comparing base (fd7cc21) to head (5844df8).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2997      +/-   ##
==========================================
- Coverage   78.70%   78.70%   -0.01%     
==========================================
  Files         188      188              
  Lines       11051    11050       -1     
==========================================
- Hits         8698     8697       -1     
  Misses       2090     2090              
  Partials      263      263              

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[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: izabelacg
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[dprotaso]

This is a breaking change and not something we want.

The serving issue is about removing the bit of code where we set the header on the deployment readiness/liveness etc.

The kubelet that does the proxying still adds this user agent so we still need to handle them accordingly.

[dprotaso]

Circling back - I misread the PR (early morning reviews are bad for me)

The changes in the PR are good but I think we should merge them after the deployment changes have been around for a release. So this should land for 1.15

See details here: knative/networking#950 (comment)

/hold

[knative-prow]

@izabelacg: 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
unit-tests_pkg_main	5844df8	link	true	/test unit-tests

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