[test-quarantine] Unquarantine Kestrel TLS tests (issue #65851)

[github-actions]

Removes [QuarantinedTest] from three Kestrel TLS tests that have been passing with a 100% pass rate for 30+ days in the quarantined-tests pipeline (definition 84, 30 builds over the past 30 days).

Tests unquarantined:

• SniOptionsSelectorTests.FallsBackToHttpsConnectionAdapterCertificate
• KestrelConfigurationLoaderTests.LoadDevelopmentCertificate_LoadBeforeUseHttps
• KestrelConfigurationLoaderTests.LoadDevelopmentCertificate_UseHttpsBeforeLoad

These tests were quarantined on 2026-03-18 due to OpenSSL-related TLS flakiness (issue #65851). The underlying OpenSSL issue has since resolved and all three tests have been stable.

Closes #65851

Note

🔒 Integrity filter blocked 6 items

The following items were blocked because they don't meet the GitHub integrity level.

• #65815 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65817 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65827 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #65816 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• fix flaky Microsoft.AspNetCore.SignalR.Client.Tests.TestServerTests.WebSocketsWorks #65928 pull_request_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• fix(http2/3): add trailer headers timeout #66249 pull_request_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

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