chore: set fail-fast to true on test matrix (#218)

## Description

...

## 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
Steps](https://github.com/defenseunicorns/uds-package-gitlab/blob/main/CONTRIBUTING.md#developer-workflow)
followed

.github/workflows/test.yaml

@@ -52,7 +52,7 @@ jobs:
   validate:
     needs: check-flavor
     strategy:
-      fail-fast: false
+      fail-fast: true
       matrix:
         type: [install, upgrade]
         flavor: [upstream, registry1]