chore(selfhost): remove dead nonConsumingRetryDelayMs export in queue-common.ts

[JSONbored]

Context

src/selfhost/queue-common.ts:692-694 exports nonConsumingRetryDelayMs, a trivial pass-through alias (return githubRateLimitRetryDelayMs(error);). Its only reference besides its own definition anywhere in the repo is test/unit/selfhost-queue-common.test.ts. Its sibling consumingRetryDelayMs is real and used by both queue backends.

Requirements

• Confirm via a fresh repo-wide search that nonConsumingRetryDelayMs has zero real (non-test) callers.
• Remove it and its dedicated test coverage.

Deliverables

• nonConsumingRetryDelayMs removed.

Expected Outcome

No orphaned alias function remains alongside its actually-used sibling.

Links & Resources

• src/selfhost/queue-common.ts:692-694

[linear-code]

JSO-4372