refs #6301
- Make sure that every fixture operation has a check to ensure that it hasn't already run
- E.g. The update of sort_order on posts_tags should only happen if there are no values which aren't a zero
- This makes sure that we don't accidentally overwrite data on FORCE_MIGRATE
- No need to try to set settings types if they are already correct
- Only update the admin client if it needs it, else we're regenerating secrets each time
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