Bugfix/fix privileges in system migration block #122217
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Reverts #121120 with a fix for #120566, which was causing the system index migration service to fail when security was enabled.
This PR removes a potential cause of data loss when migrating system indices. It does this by changing the way we set a "write-block" on the system index to migrate - now using a dedicated transport request rather than a settings update. Furthermore, we no longer delete the write-block prior to deleting the index, as this was another source of potential data loss. Additionally, we now remove the block if the migration fails.
This is a backport of #121327
Jira: ES-9724