the origin metrics of `isolation level ` is not zero if `isolation level` is changed.
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Description
## Bug Report
The origin `isolation level` metircs can not reset zero if `isolation level` is changed.
The sum of label should equal to the count of the regions in cluster.
the promQL is: `pd_regions_label_level{}`
### What did you do?
scale out from single center to three centers, so the new `isolation level` is "zone".
### What did you expect to see?
the host's `isolation level` shoule be zero and the count of the label should equal to the count of the regions in cluster.
### What did you see instead?
the host's `isolation level` is not zero.
### What version of PD are you using (`pd-server -V`)?
v4.0.12
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