Add Istio inject label

[pierDipi]

Ref: #8204

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Project coverage is 66.57%. Comparing base (641cbb7) to head (a6a4097).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ciler/apiserversource/resources/receive_adapter.go	81.81%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8205      +/-   ##
==========================================
- Coverage   66.57%   66.57%   -0.01%     
==========================================
  Files         371      371              
  Lines       18271    18281      +10     
==========================================
+ Hits        12164    12170       +6     
- Misses       5323     5325       +2     
- Partials      784      786       +2     

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[pierDipi]

/test unit-tests

[matzew]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, pierDipi

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