cel: add support for re-evaluating CEL expression on response path

[leonm1]

Commit Message:
cel: add support for re-evaluating CEL expression on response path

Additional Description:
Changes the CEL expression data input to return MoreDataMightBeAvailable if any of request_headers, response_headers, or response_trailers is not available at the time of evaluation.

Re-evaluates CEL expression iff the response data was attempted to be read during the first (request phase) evaluation AND the expression result was no-match.

If the expression was a match, (aiui) the matcher will not call the CEL matcher's match function again.

If the expression was not a match and the response data was NOT evaluated in the CEL expression, then the no-match result is cached for the next filter callback. The matcher will re-invoke the CEL matcher's match function, but the match function will just return the cached result.

Risk Level: medium. Modification of existing work-in-progress filter.
Testing: Unit tested in test/extensions/matching/input_matchers/cel_matcher/cel_matcher_test.cc, manual end-to-end testing done.

Docs Changes: None.
Release Notes: Added note to current release notes.
Platform Specific Features:
Runtime guard: None.

[leonm1]

@yanavlasov this is the PR we discussed would come after #40800. PTAL at your earliest convenience!

[kyessenov]

@leonm1 please mark as ready to receive reviews. I'll assign to Yan, but they can re-assign if needed.

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions]

This pull request has been automatically closed because it has not had activity in the last 37 days. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!