Standardize PR template across repos.

Co-authored-by: zbleness <[email protected]>

.github/pull_request_template.md

@@ -1,51 +1,9 @@
-<!--
+## Why do I want to contribute this?
 
-Thanks for submitting a PR!
+The title says it all - no more details are necessary.
 
-Before pressing 'Create pull request' please read the checklist below.
+---
 
-* All code changes should be accompanied by tests. If you are not
-modifying any tests, provide a short explanation of why.
-
-* All changes to public APIs **must** be accompanied by
-docs.
-
-* Commit messages should explain _why_ you made the changes, not just what
-you changed. Use an active, imperative voice and keep the subject line short.
-
-* We strongly encourage you to sign all commits, if possible.
-
-For more information on contributing, check the [guidelines](../CONTRIBUTING.md).
-
--->
-
-### What changes are made in this PR?
-
-<!--
-Include a short description of what changes were made.
--->
-
-### Why are these changes needed?
-
-<!--
-Include a short description of why the changes were made.
--->
-
-
-### Notes for reviewers:
-
-<!--
-Information that you think is pertinent for reviewers.
--->
-
-### Additional information:
-
-<!--
-Anything else you want to be known or think merits discussion in the context of this PR.
--->
-
-### Related issues:
-
-<!--
-Links to issues that will be closed by this PR, if any.
--->
+- [ ] This PR is linked to an issue **or** explains its purpose
+- [ ] This PR does not impact security
+- [ ] This PR does not impact functional safety (leave unchecked if unsure)