chore: add additional step to pr request template (#1104)

## Description
Update the PR template to encourage users to share steps to reproduce
validations for new changes.

## Related Issue

Fixes #
<!-- or -->
Relates to #

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] 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](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)
followed

---------

Co-authored-by: Micah Nagel <[email protected]>

.github/pull_request_template.md

@@ -14,6 +14,9 @@ Relates to #
 - [ ] New feature (non-breaking change which adds functionality)
 - [ ] Other (security config, docs update, etc)
 
+## Steps to Validate
+- If this PR introduces new functionality to UDS Core or addresses a bug, please document the steps to test the changes.
+
 ## Checklist before merging
 
 - [ ] Test, docs, adr added or updated as needed