Refactor interface type check to more idiomatic syntax

[rramkumar1]

The end behavior is the same but casting the underlying struct type to a nil pointer is more idiomatic that declaring a pointer to an empty struct.

This isn't something that's explicity mentioned in the Go style guide but has been adopted as a common pattern (e.g https://github.com/uber-go/guide/blob/master/style.md#verify-interface-compliance)

(Note: I did manually edit one file and then prompt an LLM to do the rest for me)

/assign @hakman

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