Revert: Abilities API core/get-settings ability.

[jorgefilipecosta]

Revert: Abilities API's core/get-settings ability.

This reverts [61600]. Other core abilities did not made into 7.0 beta 1 timeline, so adding justa single bability does not adds much value and we are temporarily reverting this addition.
This commit is just a clean execution of the revert command.

Props jorgefilipecosta, jason_the_adams, justlevine.
See #64455.

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Props jorgefilipecosta.

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[jorgefilipecosta]

Committed at 87b7673