Unity builder v4 Parity Update (#246)

- Updated activation strategy to align with builder strategy for more stable activation with retry logic
- Added `containerRegistryImageVersion` and `containerRegistryRepository` for improved custom image support
- Added `runAsHostUser` to fix self-hosted runner issues
- Scripts folder cleanup
- Added error/warning annotations for activation issues
- Improved serial masking
- Image environment factory addition and docker refactoring

.github/pull_request_template.md

@@ -2,10 +2,27 @@
 
 - ...
 
+#### Related Issues
+
+- ...
+
+#### Related PRs
+
+- ...
+
+#### Successful Workflow Run Link
+
+PRs don't have access to secrets so you will need to provide a link to a successful run
+of the workflows from your own repo.
+
+- ...
+
 #### Checklist
 
 <!-- please check all items and add your own -->
 
 - [x] Read the contribution [guide](../CONTRIBUTING.md) and accept the [code](../CODE_OF_CONDUCT.md) of conduct
+- [ ] Docs (If new inputs or outputs have been added or changes to behavior that should be documented. Please make a PR
+      in the [documentation repo](https://github.com/game-ci/documentation))
 - [ ] Readme (updated or not needed)
 - [ ] Tests (added, updated or not needed)