Apply static resources without updating cke.cybozu.com/revision manually

[ysksuzuki]

What

CKE updates static resources if cke.cybozu.com/revision is updated, so the revision needs to be updated manually when the resource is edited.
This is error-prone, in fact, the failure due to the revision update missing has occurred.

How

Detect differences of YAML files using equality.DeepDerivative, and if there're differences then server-side apply.

Checklist

• Finish implentation of the issue
• Test all functions
• Have enough logs to trace activities
• Notify developers of necessary actions