[1.21.1] Biomemodifications: Check to make sure Feature isn't present before adding it. BackPort of #4323 #4338
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Fixes an issue where a feature order cycle error will happen because a feature may be added to a biome twice. This can occur if a biome appears in more than one tag and you want a feature in biomes from both tags, currently it gets added twice to the biome causing a feature order cycle error