fix(k8s): watch_endpoint_slices_schema should be watch_endpoint_slices

[paradin]

config watch_endpoint_slices not watch_endpoint_slices_schema

Description

Fixes # (issue)

Checklist

• [ ] I have explained the need for this PR and the problem it solves
• [ ] I have explained the changes or the new features added to this PR
• [ ] I have added tests corresponding to this change
• [ ] I have updated the documentation to reflect this change
• [ ] I have verified that this change is backward compatible (If not, please discuss on the APISIX mailing list first)

[monkeyDluffy6017]

Can we add test cases to cover this?

[nitishfy]

@paradin are you still available to work on this?

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