This option was introduced in T272032 to control whether the rate limit for creating entity IDs is enabled or not. Once it’s been successfully enabled on Wikidata, we should remove it from Wikibase: it shouldn’t be needed in regular operation. (If someone doesn’t want the rate limit to be enforced, they could just configure it to be a very high limit.)

Acceptance criteria ⛺✨ :

• The option is removed from Wikibase (note: unlike in T274156, we don’t want to remove the associated code – the rate limit should be unconditionally enabled)
• The option is removed from the production config
• double-check that "ID-Generation-Rate-Limiting" exists as a feature in the Changelog