Squash migrations up to 20210706115312
What does this MR do and why?
Squashes all regular and post migrations to version 20210706115312. Also removes unneeded support code for background migrations plus all spec files for background and regular migrations that are not needed anymore.
How to set up and validate locally
Run bundle exec db:migrate
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.
Related to #370640 (closed)