prepare_snap: establish connection to all stores before pausing admin (#51449) #52567
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This is an automated cherry-pick of #51449
What problem does this PR solve?
Issue Number: close #51448
Problem Summary:
Now if we cannot connect to a TiKV, it will block at creating connection.
But, in this scenario, some of TiKVs' admin commands are paused. That will impact the TP workload more.
What changed and how does it work?
After this PR, we won't pause the admin commands before connections to all TiKV nodes established.
Check List
Tests
Release note
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