Update PR template and post-merge comment for changelogger

.github/PULL_REQUEST_TEMPLATE.md

@@ -25,13 +25,10 @@ Closes # .
 * [ ] Have you added an explanation of what your changes do and why you'd like us to include them?
 * [ ] Have you written new tests for your changes, as applicable?
 * [ ] Have you successfully run tests with your changes locally?
+* [ ] Have you created a changelog file by running `pnpm nx affected --target=changelog`?
 
 <!-- Mark completed items with an [x] -->
 
-### Changelog entry
-
-> Enter a summary of all changes on this Pull Request. This will appear in the changelog if accepted.
-
 ### FOR PR REVIEWER ONLY:
 
 * [ ] I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

.github/workflows/scripts/add-post-merge-comment.php

@@ -57,7 +57,6 @@ echo "The pull request was merged by: $merger_user_name\n";
 
 $comment_body = "Hi @$merger_user_name, thanks for merging this pull request. Please take a look at these follow-up tasks you may need to perform:
 
-- [ ] Add the `release: add changelog` label
 - [ ] Add the `release: add testing instructions` label";
 
 $add_comment_mutation = "