move changelog delimiters to changelog tracker (#36828)

Co-authored-by: Catalina Peralta <[email protected]>

Author: catalinaperalta

scripts/breaking_changes_checker/changelog_tracker.py

@@ -171,4 +171,6 @@ def _build_md(content: list, title: str, buffer: list):
         if self.breaking_changes:
             _build_md(self.breaking_changes, "### Breaking Changes", buffer)
         content =  "\n".join(buffer).strip()
+
+        content = "===== changelog start =====\n" + content + "\n===== changelog end =====\n"
         return content

scripts/breaking_changes_checker/detect_breaking_changes.py

@@ -321,9 +321,8 @@ def test_compare_reports(pkg_dir: str, changelog: bool, source_report: str = "st
 
     remove_json_files(pkg_dir)
 
-    print("===== changelog start =====")
     print(checker.report_changes())
-    print("===== changelog end =====")
+
     if not changelog and checker.breaking_changes:
         exit(1)