Adding the rekt test for pingsource with broker as sink

[Leo6Leo]

Fixes #6932

Proposed Changes

• A rekt-based e2e test for PingSource TLS support when using Broker as sink

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

Release Note

Added a rekt-based e2e test for PingSource TLS support when using Broker as sink

Docs

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0684dbe) 76.74% compared to head (4bbe5b9) 76.74%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7416   +/-   ##
=======================================
  Coverage   76.74%   76.74%           
=======================================
  Files         253      253           
  Lines       13916    13916           
=======================================
  Hits        10680    10680           
  Misses       2702     2702           
  Partials      534      534           

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[Leo6Leo]

/cc @pierDipi @creydr @Cali0707

[pierDipi]

LGTM overall, a few comments to clean up the unused code

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Leo6Leo, pierDipi

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