Improve addons folder unit tests

[iancoffey]

(This is used to request new product features)

Describe the feature request
Improve unit tests for addons/pkg/utils and addons/pinniped/post-deploy.

Describe alternatives you've considered

Affected product area (please put an X in all that apply)

[ ] APIs
[x] Addons
[ ] CLI
[ ] Docs
[ ] Installation
[ ] Plugin
[ ] Security
[ ] Test and Release
[ ] User Experience

Additional context

[ankeesler]

fyi - there is an issue for backfilling addons/pinniped/post-deploy unit tests: #62