Dynamically lower the GC interval

[DL6ER]

What does this implement/fix?

Dynamically lower the GC interval from ten minutes to one minute when the user explicitly requests webserver.api.maxHistory = 0.0. This should help with #2126 and https://discourse.pi-hole.net/t/pihole-crash-reason-shared-memory-tmpfs-dev-shm-100/74204

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Related issue or feature (if applicable): see above

Pull request in docs with documentation (if applicable): N/A

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