Don't exit the release script if there are uncommitted changes

Instead, all the user to fix them and retry.

scripts-dev/release.py

@@ -820,8 +820,10 @@ def get_repo_and_check_clean_checkout(
         raise click.ClickException(
             f"{path} is not a git repository (expecting a {name} repository)."
         )
-    if repo.is_dirty():
-        raise click.ClickException(f"Uncommitted changes exist in {path}.")
+    while repo.is_dirty():
+        if not click.confirm(f"Uncommitted changes exist in {path}. Commit or stash them. Ready to continue?"):
+            raise click.ClickException("Aborted.")
+
     return repo