chore: ensure consistent file naming for non-enterprise files.

[jrasell]

Files mostly use the _oss.go pattern apart from these ones, which
confused me for a moment when I first came across one. I also fixed-up
the unused function param style where needed.

[tgross]

LGTM.

We used to have _pro.go suffixes for the weird middle-of-the-road ENT builds but I just checked the ENT repo and those are all gone now.

[github-actions]

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