docs: Update pull request template.

Also removing link to https://openedx.atlassian.net/wiki/spaces/SRE/pages/28967861/Ops+Ansible+Testing+Checklist since

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,10 +3,7 @@ Configuration Pull Request
 
 Make sure that the following steps are done before merging:
 
-  - [ ] A SRE team member has approved the PR if it is code shared across multiple services and you don't own all of the services.
-  - [ ] Are you adding any new default values that need to be overridden when this change goes live? If so:
-    - [ ] Update the appropriate internal repo (be sure to update for all our environments)
-    - [ ] If you are updating a secure value rather than an internal one, file a SRE ticket with details.
-    - [ ] Add an entry to the CHANGELOG.
-  - [ ] If you are making a complicated change, have you performed the proper testing specified on the [Ops Ansible Testing Checklist](https://openedx.atlassian.net/wiki/spaces/SRE/pages/28967861/Ops+Ansible+Testing+Checklist)?  Adding a new variable does not require the full list (although testing on a sandbox is a great idea to ensure it links with your downstream code changes).
-  - [ ] Think about how this change will affect Open edX operators.  Have you updated the wiki page for the next Open edX release?
+  - [ ] Have a Site Reliability Engineer review the PR if you don't own all of the services impacted.
+  - [ ] If you are adding any new default values that need to be overridden when this change goes live, update internal repos and add an entry to the top of the CHANGELOG.
+  - [ ] Performed the appropriate testing.
+  - [ ] Think about how this change will affect Open edX operators and update the wiki page for the next Open edX release if needed