feat(ci): include unboundsoftware CI templates in pipeline

Add unboundsoftware CI templates to the pipeline configuration. This 
enhances the existing CI workflow by incorporating standard defaults, 
ensuring consistency and reducing redundancy in configuration.

.gitlab-ci.yml

@@ -1,5 +1,7 @@
 include:
 - template: 'Workflows/MergeRequest-Pipelines.gitlab-ci.yml'
+- project: unboundsoftware/ci-templates
+  file: Defaults.gitlab-ci.yml
 
 stages:
   - build