Fix audit and framework deletion

Signed-off-by: Sacha Al Himdani <sacha@getprobo.com>

pkg/coredata/migrations/20251208T172842Z.sql

@@ -0,0 +1,4 @@
+ALTER TABLE nonconformities DROP CONSTRAINT IF EXISTS nonconformities_audit_id_fkey;
+ALTER TABLE nonconformities ALTER COLUMN audit_id DROP NOT NULL;
+ALTER TABLE nonconformities ADD CONSTRAINT nonconformities_audit_id_fkey
+    FOREIGN KEY (audit_id) REFERENCES audits(id) ON UPDATE CASCADE ON DELETE SET NULL;