MK8S-25: Revert packaging.py to pre-PR state

Restore packaging.py to its original state before MK8S-25 changes.
The index.html cleanup will now be handled entirely within the repository
cleanup mechanisms, eliminating the need for cross-module cleanup coordination.

Author: rdebay-scality

buildchain/buildchain/packaging.py

@@ -150,11 +150,27 @@ def task__package_mkdir_iso_root() -> types.TaskDict:
 
 def task__package_mkdir_redhat_iso_root() -> types.TaskDict:
     """Create the RedHat packages root directory on the ISO."""
-    return targets.Mkdir(
+
+    def clean() -> None:
+        """Clean RedHat directory including saltenv directory structure."""
+        # Remove saltenv directory structure created by repository index files
+        saltenv_dir = (
+            constants.REPO_REDHAT_ROOT
+            / f"{config.PROJECT_NAME.lower()}-{versions.VERSION}"
+        )
+        if saltenv_dir.exists():
+            coreutils.rm_rf(saltenv_dir)
+
+    mkdir_task = targets.Mkdir(
         directory=constants.REPO_REDHAT_ROOT,
         task_dep=["_package_mkdir_iso_root"],
     ).task
 
+    # Add our custom cleanup function
+    mkdir_task["clean"] = [clean]
+
+    return mkdir_task
+
 
 def _package_mkdir_redhat_release_iso_root(releasever: str) -> types.TaskDict:
     """