[Bug]: cordoned CN store should not block CN rolling-update

[aylei]

Is there an existing issue for the same bug?

• [X] I have checked the existing issues.

Environment

• Version or commit-id (e.g. v0.1.0 or 8b23a93): 1.0.0-alpha.2
• Hardware parameters:
• OS type:
• Others:

Actual Behavior

kg po -n freetier-02
NAME                             READY   STATUS    RESTARTS        AGE
default-cn-5khbn                 1/1     Running   3 (15h ago)     16h
default-cn-78b2w                 1/1     Running   0               10m
default-cn-rm9vm                 1/1     Running   14 (12m ago)    16h

default-cn-5khbn is cordoned, which blocked CN rolling-upgrade

Expected Behavior

No response

Steps to Reproduce

No response

Additional information

No response