Fix the problem that adaptive update interval doesn't recovers back and there's too much logs about setting the config (#1502)

[MyonKeminta]

Cherry picks https://github.com/tikv/client-go/pull/1502 to tidb-7.1 branch

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[LGTM Timeline notifier]

Timeline:

• 2024-11-19 08:42:26.597807281 +0000 UTC m=+950508.788676263: :ballot_box_with_check: agreed by crazycs520.