Be more explicit about the semantic of ceOverrides

[lionelvillard]

Proposed Changes

• Make it explicit in the source spec that ceOverrides cannot override required CE attribute. Optional attributes can be specified/overridden.

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

:broom: Clarify the semantic of `ceOverrides`

Docs

[lionelvillard]

/cc @n3wscott @antoineco

[codecov]

Codecov Report

Merging #5641 (97e84cc) into main (c183833) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5641   +/-   ##
=======================================
  Coverage   82.73%   82.73%           
=======================================
  Files         200      200           
  Lines        6266     6266           
=======================================
  Hits         5184     5184           
  Misses        750      750           
  Partials      332      332           

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[antoineco]

/lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: antoineco, lionelvillard

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