tikv
*: fix sync isolation level to default placement rule (#7122)
This is an automated cherry-pick of #7122
What problem does this PR solve?
Issue Number: Close #7121.
What is changed and how does it work?
This PR will sync the isolation level to the default rule when setting config with HTTP API or pd-ctl.
Check List
Tests
- Unit test
Release note
None.
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[APPROVALNOTIFIER] This PR is APPROVED
This pull-request has been approved by: HuSharp, lhy1024
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