Fixes #14433.

The function for shutting down a provisioner daemon has the signature:

func (p *Server) Shutdown(ctx context.Context, cancelActiveJob bool) error

The coder server code for handling graceful provisioner shutdowns was correct:

err := shutdownWithTimeout(func(ctx context.Context) error {
// We only want to cancel active jobs if we aren't exiting gracefully.
return provisionerDaemon.Shutdown(ctx, !waitForProvisionerJobs)
}, timeout)

Whilst the matching code for graceful shutdowns of independent provisioner daemons (coder provisionerd start) was not:

err = srv.Shutdown(ctx, waitForProvisionerJobs)

This wasn't caught by tests as I don't believe we have any clitests for provisionerd. The existing tests call the shutdown function directly.