feat (ci): Added minimal MR template

.gitlab/merge_request_templates/Minimal_Template.md

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+<!-- This Template states the absolute minimum for an MR.
+    If you want to have a more elaborate template or know why we have this structure,
+    please use the "Mixed Template" or consult the Wiki. -->
+<!-- Add the CI labels to trigger the appropriate tests (e.g. "unit_test_esp32") --><!-- Mandatory -->
+<!-- Make sure the commit message follows the Wiki about "Commit Messages" --><!-- Mandatory -->
+
+<!-- Add description of the change here --><!-- Mandatory -->
+
+<!-- ## Related --><!-- Optional -->
+<!-- Related Jira issues and Github issues -->
+
+## Release notes <!-- Mandatory -->
+<!-- Either state release notes or write "No release notes" -->
+
+<!-- ## Breaking change notes --><!-- Optional -->