style(clustering/compat): style clean for checkers array

[chronolaw]

Summary

We should not put all un-related checking logic into one function,
this PR moves queue and valuts checking code to new functions.

Checklist

• The Pull Request has tests
• There's an entry in the CHANGELOG
• There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HERE

[chronolaw]

@liverpool8056 , I remove clustering_data_planes, could you confirm it is ok?

[liverpool8056]

@chronolaw Yes, it's ok, clustering_data_planes is not exportable one.

[hanshuebner]

How is this change tested?

[chronolaw]

How is this change tested?

I did not change the logic, so the original test cases should still work if they do have one.

[hanshuebner]

How is this change tested?

I did not change the logic, so the original test cases should still work if they do have one.

Do automated tests exist? How did you verify that the logic is unchanged?

[chronolaw]

We already have test cases in #10776, #10755 and #10400

[chronolaw]

Rebase to #10759, more test cases to ensure it is correct.