Revise pull request template for JIRA integration

Updated the pull request template to reflect JIRA ticket format and removed summary section.

Author: Jibola

.github/workflows/PULL_REQUEST_TEMPLATE.md

@@ -1,8 +1,4 @@
-[Issue Key](https://jira.mongodb.org/browse/{ISSUE_KEY})
-
-## Summary
-
-<!-- What is this PR introducing? If context is already provided from the JIRA ticket, still place it in the Pull Request as you should not make the reviewer do digging for a basic summary. -->
+[JIRA TICKET](https://jira.mongodb.org/browse/{JIRA_TICKET})
 
 ## Changes in this PR