Investigate flaky TestEndpointsReturnOk coverage

[Copilot]

Description

TestEndpointsReturnOk remains quarantined due to historically unrelated, app-specific failures. This draft records that no scoped product or test-harness change is supported by the available failure evidence.

• Investigation outcome
  • Local reproduction fails during DCP startup, before endpoint requests.
  • Historical failures include distinct readiness and address-in-use failures.
  • No code change is proposed pending a current failure signature or the linked Azure DevOps log.

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No

• Fixes Flaky tests rollup: TestEndpointsReturnOk #6866

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[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.sh | bash -s -- 19943

Or

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iex "& { $(irm https://raw.githubusercontent.com/microsoft/aspire/main/eng/scripts/get-aspire-cli-pr.ps1) } 19943"