Deflake TestIntegrations/DifferentPinnedIP

[zmb3]

Wait for the node to be regsitered before attempting to dial it.

Closes #55697

[rosstimothy]

This should already be automatically happening in the Start call on line 234 above.

teleport/integration/helpers/instance.go

Lines 1395 to 1405 in 3697eac

	// Wait for any SSH instances to be visible in the inventory before returning
	// to prevent any immediate connection attempts from failing because the host
	// has not yet been propagated to the caches.
	expectedNodes := len(i.Nodes)
	if i.Config.SSH.Enabled {
	expectedNodes++
	}
	if err := i.WaitForNodeCount(context.Background(), i.Secrets.SiteName, expectedNodes); err != nil {
	return trace.Wrap(err)
	}

[zmb3]

Ah, you know I was thinking that would be good default behavior.

[rosstimothy]

I'm not certain this will truly resolve the flake. I think there is a more systemic issue that is plaguing this and other tests.