Add info about runtime calculations & avoiding downtime to styleguide
What does this MR do and why?
Related to #393569 (closed)
Add documentation to Advanced Search migration styleguide:
- how to calculate runtime
- when to merge
- what to do when migrations have issues on production
- some header/indentation refactoring
Screenshots or screen recordings
N/A
How to set up and validate locally
N/A
MR acceptance checklist
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Edited by Terri Chu