Update 8.14-rc1 migrations to minimize downtime and deploy time

What does this MR do?

Modify 8.14-rc1 migrations and code to minimize downtime and deploy time

Are there points in the code the reviewer needs to double check?

No

Why was this MR needed?

8.14-rc1 migrations took too much time in staging, so we didn't want to take too much downtime in production

Does this MR meet the acceptance criteria?

• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #24386 (closed)