Remove free user cap email notification related workers
What does this MR do and why?
- Removes all codes related to the free user cap email notification workers;
- Add migration to remove related jobs;
- Add migration to drop the related database columns.
Related to #415486
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Roy Liu