Adjust test-sites.json churn rate

[ctz]

Prior to this PR any expired cert in test-sites.json causes test failure. This replaces it with a 30-day expiry of the data set, along with acceptance of expired certs.

[codspeed-hq]

Merging this PR will not alter performance

✅ 4 untouched benchmarks

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_{Comparing jbp-adjust-test-data-churn (9fcb71b) with main (fdc7153)}

[Copilot]

Pull request overview

This PR reduces churn in revoke-test/test-sites.json by adding an explicit dataset freshness window (30 days) and adjusting system tests to tolerate certificates that have expired since the dataset was generated.

Changes:

• Add a timestamp to RevocationTestSites and an expired() helper to enforce a 30-day dataset TTL.
• Update system tests to fail fast on an expired dataset and to classify rustls certificate expiry errors as TestResult::Expired.
• Regenerate/update test-sites.json content to include the new timestamp field and refreshed certificate/error details.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 3 comments.

File	Description
revoke-test/tests/system_tests.rs	Adds dataset TTL assertion; adds handling/reporting for expired-certificate verification outcomes.
revoke-test/test-sites.json	Updates test vectors and adds a top-level timestamp used for dataset TTL.
revoke-test/src/lib.rs	Extends RevocationTestSites with timestamp and implements 30-day expiration logic.
revoke-test/src/bin/fetch.rs	Writes the current Unix timestamp into the generated test-sites.json.

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[djc]

Nice!