Checkers should check evict leader scheduler.
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Description
## Feature Request
Rule checker should consider of evict leader scheduler in single replica cluster.
### Describe your feature request related problem
When I deleted 2 stores and add `evict leader to one node in one replica cluster, the operator could not be created.
offline region doesn't decrease:
rule checker patrol:
log in pd:
```
[2022/01/14 18:01:21.883 +08:00] [DEBUG] [rule_checker.go:108] ["fail to fix rule peer"] [rule-group=pd] [rule-id=default] [error="no valid leader"]
```
### Describe the feature you'd like
The `rule checker` works well even if there are some `evict leader scheduler ` in single replica cluster.
### Describe alternatives you've considered
### Teachability, Documentation, Adoption, Migration Strategy
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Assessment
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