chore: Adding checkbox for changelog updates (#6012)

Author: yhakbar

.github/pull_request_template.md

@@ -1,4 +1,4 @@
-<!-- Prepend '[WIP]' to the title if this PR is still a work-in-progress. Remove it when it is ready for review! -->
+<!-- Keep this PR in draft while it is still a work-in-progress. Mark it as ready for review once it is ready for review by maintainers. -->
 
 ## Description
 
@@ -14,15 +14,7 @@ Read the [Gruntwork contribution guidelines](https://gruntwork.notion.site/Grunt
 - [ ] I am submitting code based on open source software (e.g. MIT, MPL-2.0, Apache)
 - [ ] I am adding or upgrading a dependency or adapted code and confirm it has a compatible open source license
 - [ ] Update the docs.
+- [ ] Update the changelog in the docs.
 - [ ] Run the relevant tests successfully, including pre-commit checks.
-- [ ] Include release notes. If this PR is backward incompatible, include a migration guide.
-
-## Release Notes (draft)
-
-<!-- One-line description of the PR that can be included in the final release notes. -->
-Added / Removed / Updated [X].
-
-### Migration Guide
-
-<!-- Important: If you made any backward incompatible changes, then you must write a migration guide! -->
-
+- [ ] This change is backwards compatible.
+- [ ] If this change is not forwards compatible (e.g. a new feature), it is gated behind a feature flag.