Drop workaround patch for Istio

[nak3]

As per title, this patch drops the workaround patch for Istio.

istio/istio#31084 and #10160 have been resolved already.

[knative-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 ⚠️

Comparison is base (a5c8c2e) 86.25% compared to head (44c0396) 86.23%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14156      +/-   ##
==========================================
- Coverage   86.25%   86.23%   -0.03%     
==========================================
  Files         199      199              
  Lines       14811    14811              
==========================================
- Hits        12775    12772       -3     
- Misses       1734     1735       +1     
- Partials      302      304       +2     

see 1 file with indirect coverage changes

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[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, nak3

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