Add attribute filter transform function

[Cali0707]

Fixes #7685

Proposed Changes

• Add a transform function for an attributes filter
• Use the transform function depending on the filter on the trigger in the constructor

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707

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[Cali0707]

/cc @Leo6Leo @pierDipi @creydr

This is just WIP until I add unit tests (probably tomorrow), so the actual changes are ready for a review!

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 92.72727% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 69.49%. Comparing base (7e1c082) to head (c0a7e97). Report is 46 commits behind head on main.

Files	Patch %	Lines
pkg/graph/constructor.go	84.61%	1 Missing and 1 partial :warning:
pkg/graph/transforms.go	95.23%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7909      +/-   ##
==========================================
+ Coverage   69.22%   69.49%   +0.27%     
==========================================
  Files         339      344       +5     
  Lines       19494    15943    -3551     
==========================================
- Hits        13494    11079    -2415     
+ Misses       5337     4187    -1150     
- Partials      663      677      +14     

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[Cali0707]

rbac.go:40: an error on the server ("Internal Server Error: \"/apis/rbac.authorization.k8s.io/v1/namespaces/test-ngogqfqt/rolebindings/subscriber-walrgdtq\": the server is currently unable to handle the request") has prevented the request from succeeding

Looks like GKE issues

/retest-required

[Cali0707]

/cc @Leo6Leo @creydr @pierDipi

This is ready for review now

[Cali0707]

/cc @Leo6Leo

[Cali0707]

/test upgrade-tests

[Leo6Leo]

/lgtm

[Cali0707]

Whoops @pierDipi looks like this somehow got merged before I could address your feedback. I'll open a follow up PR later today to try and make the changes you asked for