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Remove expired rdataset headers from the heap

Ondřej Surý requested to merge 4591-improve-ttl-based-cleaning into main

It was discovered that an expired header could sit on top of the heap a little longer than desireable. Remove expired headers (headers with rdh_ttl set to 0) from the heap completely, so they don't block the next TTL-based cleaning.

Closes #4591 (closed)

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