Consider container commands in Statefulset diffs

[baarde]

#2449 added Command to sidecars.

So container's commands should be compared when deciding whether a Statefulset has been updated.

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[mikkeloscar]

Would be good to expand the test cases to cover this

[mortenlj]

When a sidecar is defined in the OperatorConfiguration, all fields on the container may be specified. One commonly used would be args, it would probably be nice to compare those too.