Pull request template (#10813)

.github/PULL_REQUEST_TEMPLATE.md

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+Thanks for submitting a pull request!
+Please confirm that your pull request follows our guidelines found in CONTRIBUTING and that you provide enough information so that we can review your pull request.
+
+<Description of pull request, e.g. "Fix Grid Column not sortable with backend data and sort property">
+
+Fixes #<replace with an issue number>
+
+**Check when you have completed**
+[ ] Valid tests for the pull request
+[ ] Contributing guidelines implemented