Replace all interface{} with any (Go 1.18+)

[chaewonkong]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Replaces all instances of interface{} with any for improved readability and modern Go style.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
No functional changes; this is a style cleanup to use any instead of interface{} in Go 1.18+.

Release note:

NONE

[k8s-ci-robot]

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