Update docs: PR template update (#882)

Used for testing new workflow permissions.
Updates PR template with testing question.

.github/pull_request_template.md

@@ -4,6 +4,13 @@
 
 ### Why did you make the changes?
 
+### Did you run tests?
+<!---IMPORTANT NOTE ABOUT RUNNING TESTS: ->
+- Some tests may require multiple runs before success.
+- Some test failures may not be due to your contribution and can be ignored.
+- If tests fail without resolution, please let us know here.
+- Directions for running tests are in the README.md 
+
 <!--- PR CHECKLIST: PLEASE REMOVE BEFORE SUBMITTING —>
 Before submitting, check that you have completed the following tasks:
 - [ ] Answered the questions above.