Add finalization migration for emails_enabled
What does this MR do and why?
This MR finalizes the batched migration for the emails_enabled column creation and data migration which was introduced in !93005 (merged).
This makes progress toward a part of #24733 (closed), which will end with the email settings UI being transitioned to reflect the "positive" connotation of the email setting.
Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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