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[9.20] fix: usr: Improve the memory cleaning in the SERVFAIL cache

bind-team-rw-api-rw-repo requested to merge backport-5025-improve-badcache-cleaning-9.20 into bind-9.20

The SERVFAIL cache doesn't have a memory bound and the cleaning of the old SERVFAIL cache entries was implemented only in opportunistic manner. Improve the memory cleaning of the SERVFAIL cache to be more aggressive, so it doesn't consume a lot of memory in the case the server encounters many SERVFAILs at once.

Closes #5025 (closed)

Backport of MR !9760 (merged)

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