crls: improve coverage of owned representation.

[cpu]

tests: improve crl unit test coverage.

• Adds coverage for the OwnedCertRevocationList representation.
• Adds coverage for too large CRL number.

tests: generate owned client auth revocation tests.

Previously the generate.py generated tests for client auth revocation checking with CRLs used only the borrowed CRL representation. We also want equivalent coverage for the owned CRL representation that's gated by the alloc feature.

This commit updates the generator logic to also produce tests for the owned representation, gating those tests on the alloc feature.

[cpu]

ci / coverage (pull_request) Failing after 34s

Oops, forgot to rebase on the token change. Fixing.

[cpu]

[2023-07-04T14:15:31.499Z] ['error'] There was an error running the uploader: Error uploading to https://codecov.io: Error: There was an error fetching the storage URL during POST: 404 - {'detail': ErrorDetail(string='Unable to locate build via Github Actions API. Please upload with the Codecov repository upload token to resolve issue.', code='not_found')}

Hmm, still not working even with 1f0ac40 - maybe because I'm opening this PR from a fork? I could switch to pushing branches to the main repo and opening PRs from there but that won't help outside contributors who run into this problem 🤔

[ctz]

Yeah apparently GH action secrets don't work for forks :( Gah

[cpu]

Queuing to merge with one +1 since this is a fairly uninteresting test-only diff.