Rename hook_menu_local_actions_alter() to hook_local_actions_alter()

This issue is being reviewed by the kind folks in Slack, #needs-review-queue-initiative. We are working to keep the size of Needs Review queue [2700+ issues] to around 400 (1 month or less), following Review a patch or merge request → as a guide.

The MR will need to be updated for 10.1
Left a few comments on the existing MR
Ignore the one about the change record as I see we have one.

Thanks

Please review.

Seems this is a copy of MR 745 so all the feedback there is unanswered.