feat: added fake client reactor for subject access reviews

[Cali0707]

This should fix the issues with subject access reviews we are seeing in unit tests

Proposed Changes

• Add a reactor that handles create requests for subject access reviews

Note: this can probably be improved upon (for example also looking at clusterroles/clusterrolebindings), but this should be good enough for what we are testing now so I would like to merge this first before making improvements

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707

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[Cali0707]

/cc @yijie-04 @pierDipi

@yijie-04 if these changes look good to you, feel free to comment /lgtm!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 24 lines in your changes are missing coverage. Please review.

Project coverage is 69.02%. Comparing base (7e1c082) to head (da2d5d6).
Report is 34 commits behind head on main.

Files	Patch %	Lines
pkg/reconciler/testing/v1/factory.go	0.00%	23 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7908      +/-   ##
==========================================
- Coverage   69.22%   69.02%   -0.20%     
==========================================
  Files         339      341       +2     
  Lines       19494    15853    -3641     
==========================================
- Hits        13494    10943    -2551     
+ Misses       5337     4236    -1101     
- Partials      663      674      +11     

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[yijie-04]

/lgtm