[MC-307700] Sulfur springs spawn on icebergs

Currently sulfur springs (the placed structure that tells you there’s a biome underneath) can spawn on icebergs.

It is very obvious why this should not happen. It’s like ocean azaela’s again.

This should be fixed.

Linked issues

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We are tracking this issue in MC-307531, so this ticket is being resolved and linked as a duplicate.

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