chore(compute_tools): Delete unused anon_ext_fn_reassign.sql (#12787)

It's an anon v1 failed launch artifact, I suppose.

compute_tools/src/sql/anon_ext_fn_reassign.sql

@@ -1,13 +0,0 @@
-DO $$
-DECLARE
-    query varchar;
-BEGIN
-    FOR query IN
-    SELECT pg_catalog.format('ALTER FUNCTION %I(%s) OWNER TO {db_owner};', p.oid::regproc, pg_catalog.pg_get_function_identity_arguments(p.oid))
-    FROM pg_catalog.pg_proc p
-        WHERE p.pronamespace OPERATOR(pg_catalog.=) 'anon'::regnamespace::oid
-    LOOP
-        EXECUTE query;
-    END LOOP;
-END
-$$;