feat: update security policy to use provided user, group, and fsgroup (#82)

## Description

When establishing the security context for a pod, Pepr security policy
will look for labels to specify the runAsUser, runAsGroup, and/or
fsGroup and use those values.

## Related Issue

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [ ] Test, docs, adr added or updated as needed
- [ ] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)(https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md#submitting-a-pull-request

)
followed

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Co-authored-by: Micah Nagel <micah.nagel@defenseunicorns.com>