Add comment in PR template about tests passing locally

.github/ISSUE_TEMPLATE/config.yml

@@ -1,4 +1,4 @@
-blank_issues_enabled: true
+blank_issues_enabled: false
 contact_links:
   - name: Troubleshooting and User Support
     url: https://openmc.discourse.group/

.github/pull_request_template.md

@@ -15,5 +15,10 @@ Fixes # (issue)
 - [ ] I have performed a self-review of my own code
 - [ ] I have run [clang-format](https://docs.openmc.org/en/latest/devguide/styleguide.html#automatic-formatting) on any C++ source files (if applicable)
 - [ ] I have followed the [style guidelines](https://docs.openmc.org/en/latest/devguide/styleguide.html#python) for Python source files (if applicable)
-- [ ] I have added tests that prove my fix is effective or that my feature works (if applicable)
 - [ ] I have made corresponding changes to the documentation (if applicable)
+- [ ] I have added tests that prove my fix is effective or that my feature works (if applicable)
+<!--
+While tests will automatically be checked by CI, it is good practice to
+ensure that they pass locally first. See instructions here:
+https://docs.openmc.org/en/latest/devguide/tests.html
+-->