Backport fix for AutoFollowIT.testPauseAndResumeWithMultipleAutoFollowPatterns #48288
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The test testPauseAndResumeWithMultipleAutoFollowPatterns
failed multiple times, mostly because it creates too many leader
indices and the following cluster cannot cope with cluster state
updates generated by following indices creation and pause/
resume auto-followers changes.
This commit simplifies the test by creating at most 20 leader
indices and by waiting for any new leader index to be picked
up by the auto-follower before created another leader index.
It also pause and resume less auto-followers as previously.
closes #47917
Backport of #48128 for 7.5