Update PR template to include shiftleft link (Azure#20111)

Author: raych1

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,6 @@
 <i>MSFT employees can try out our new experience at <b>[OpenAPI Hub](https://aka.ms/openapiportal) </b> - one location for using our validation tools and finding your workflow. 
 </i>
+Azure 1st Party Service can try out the [Shift Left](https://aka.ms/ShiftLeft) experience to initiate API design review from ADO code repo.  If you are interested, may request engineering support by filling in with the form https://aka.ms/ShiftLeftSupportForm.
 
 ### Changelog
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