Don't require changelogs for draft PRs (#5202)

Maybe I should do this in the JS bit, not sure.

Author: michaelpj

.github/workflows/check-changelog.yml

@@ -17,6 +17,8 @@ jobs:
 
       - name: Enforce New File or 'No Changelog Required' Label
         uses: actions/github-script@v6
+        # don't require changelogs for draft PRs
+        if: github.event.pull_request.draft == false
         with:
           script: | 
             function shouldCheckChangelog() {
@@ -49,4 +51,4 @@ jobs:
               checkChangelog();
             } else {
               core.info("PR contains the label 'No Changelog Required', skipping changelog check.");
-            }
+            }