Incubator broodmothers and clinicUpgradePurge datatypeCleanup

Anurequested to merge
Anu/fc-pregmod:broodmother-incubator into pregmod-master

Closes #3237 (closed). Was simpler than I thought it would be. Tested and seems to be working just fine.

Also adjusts datatypeCleanup to clamp clinicUpgradePurge to its currently possible values, as changed in !9571 (merged).

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