[8.3] Fix FollowIndexSecurityIT.testAutoFollowPatterns (#87853) #87915
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The test FollowIndexSecurityIT.testAutoFollowPatterns sometimes
fails when verifying the monitoring documents about auto-follow
stats. I wasn't able to reproduce locally but I suspect that monitoring
collects auto-follow stats before they are updated. Instead it should
collect auto follow stats monitoring documents once indices are
effectively followed.
There are also some index / auto-follow pattern conflicts with other
tests in the same class, so this PR also changes that. In case this
fix is not enough, the full monitoring documents should appear in
test log to help further debugging.
Backport of #87853