Fix the issue that incomingBindingMetrics ignores the ClusterChanged event

[Poor12]

Signed-off-by: Poor12 [email protected]

What type of PR is this? /kind cleanup

What this PR does / why we need it: Add metrics test for scheduler.

Which issue(s) this PR fixes: Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?: None

[Poor12]

/cc @RainbowMango

[codecov-commenter]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@ab88988). Click here to learn what that means. The diff coverage is n/a.

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unittests	23.16% <0.00%> (?)

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[karmada-bot]

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