Add disruptive change mitigations section to PR template (elastic#39330)

* Add breaking changes mitigations section

* Broaden	language

.github/PULL_REQUEST_TEMPLATE.md

@@ -44,6 +44,14 @@ List here all the items you have verified BEFORE sending this PR. Please DO NOT
 - [ ] I have added tests that prove my fix is effective or that my feature works
 - [ ] I have added an entry in `CHANGELOG.next.asciidoc` or `CHANGELOG-developer.next.asciidoc`.
 
+## Disruptive User Impact
+
+<!--
+Will the changes introduced by this PR cause disruption to users in any way? If so, please describe what changes users
+could make on their end to nullify or minimize this disruption. Consider impacts in related systems, not just directly
+when using Beats.
+-->
+
 ## Author's Checklist
 
 <!-- Recommended
@@ -67,7 +75,7 @@ Link related issues below. Insert the issue link or reference after the word "Cl
 - Requires #123
 - Superseds #123
 -->
-- 
+-
 
 ## Use cases