Add Convertible interface to job sink

[matzew]

Proposed Changes

• as per title

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

Docs

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew

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• OWNERS [matzew]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.57%. Comparing base (e7fca76) to head (eb7df13).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8214   +/-   ##
=======================================
  Coverage   66.57%   66.57%           
=======================================
  Files         371      371           
  Lines       18281    18281           
=======================================
  Hits        12170    12170           
  Misses       5325     5325           
  Partials      786      786           

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