[WIP] call Tracker.OnDeletedObserver on delete wherever tracker is used

[maschmid]

Fixes #9103 maybe

Proposed Changes

• 🐛 remove references from tracker when resources are deleted

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: maschmid
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[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.12%. Comparing base (a962fa5) to head (e55df2a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/reconciler/sinkbinding/controller.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9150      +/-   ##
==========================================
+ Coverage   51.06%   51.12%   +0.06%     
==========================================
  Files         411      411              
  Lines       22130    22178      +48     
==========================================
+ Hits        11300    11339      +39     
- Misses       9958     9967       +9     
  Partials      872      872              

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[knative-prow]

@maschmid: 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
reconciler-tests_eventing_main	e55df2a	link	true	/test reconciler-tests

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