[ci]: move router-act to top level testing utils#84653

ztanner merged 1 commit intocanaryvercel/next.js:canaryfrom

10-08-_ci_move_router-act_to_top_level_testing_utilsvercel/next.js:10-08-_ci_move_router-act_to_top_level_testing_utilsCopy head branch name to clipboard