[FIX] web_widget_numeric_step: Added migration script for migration to 16.0.

Author: baguenth

web_widget_numeric_step/migrations/16.0.1.0.0/pre-migration.py

@@ -0,0 +1,15 @@
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from openupgradelib import openupgrade
+
+
+@openupgrade.migrate()
+def migrate(env, version):
+    """
+    Remove the obsolete demo view from v13/v14/v15 that references non-existing credit_limit on res.users.
+    In v16, web_widget_numeric_step no longer has this demo, and credit_limit is on res.partner.
+    """
+    # Remove by xmlid if it exists
+    openupgrade.delete_records_safely_by_xml_id(
+        env, ["web_widget_numeric_step.view_users_form"], delete_childs=True
+    )