fix(ci): fix changelog check by fetching correct ref (#23241)

* Revert "Remove base branch fetching"

This reverts commit ad73fd1.

* changelog: remove pull_request job

* Add changelog

* Use BASE_BRANCH in check_changelog_fragments.sh

* Revert "Use BASE_BRANCH in check_changelog_fragments.sh"

This reverts commit 88c12f6.

* Fetch correct sha

* Revert "Revert "Use BASE_BRANCH in check_changelog_fragments.sh""

This reverts commit 14d9bf6.

* Use ref instead of sha

* Revert "Revert "Revert "Use BASE_BRANCH in check_changelog_fragments.sh"""

This reverts commit d9d5cf8.

* Remove BASE_BRANCH entirely

* Go back to sha

* Temporarily add pull_request back

* Revert "Temporarily add pull_request back"

This reverts commit 690b5cf.

* Revert "Add changelog"

This reverts commit 165ade2.

Author: thomasqueirozb

.github/workflows/changelog.yaml

@@ -9,9 +9,6 @@
 name: Changelog
 
 on:
-  pull_request:
-    types: [opened, synchronize, reopened, labeled, unlabeled]
-
   pull_request_target:
     types: [opened, synchronize, reopened, labeled, unlabeled]
 
@@ -34,6 +31,8 @@ jobs:
         if: ${{ github.event_name != 'merge_group' }}
         with:
           fetch-depth: 0
+          repository: ${{ github.event.pull_request.head.repo.full_name }}
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - name: Bypass when no‑changelog label is present
         if: env.PR_HAS_LABEL == 'true'