Fix nil pointer dereference in WaitForDeploymentToComplete (#4993)

## Changes
- Fix nil pointer dereference in `WaitForDeploymentToComplete` when the
app deployment `Status` field is nil. Add nil checks before accessing
`Status.State` for both active and pending deployments.

## Why
If the API returns a deployment object before its status is populated,
the CLI panics with a nil pointer dereference during `bundle deploy`.

Author: denik

bundle/appdeploy/app.go

@@ -49,6 +49,7 @@ func BuildDeployment(sourcePath string, config *resources.AppConfig, gitSource *
 // WaitForDeploymentToComplete waits for active and pending deployments on an app to finish.
 func WaitForDeploymentToComplete(ctx context.Context, w *databricks.WorkspaceClient, app *sdkapps.App) error {
 	if app.ActiveDeployment != nil &&
+		app.ActiveDeployment.Status != nil &&
 		app.ActiveDeployment.Status.State == sdkapps.AppDeploymentStateInProgress {
 		logProgress(ctx, "Waiting for the active deployment to complete...")
 		_, err := w.Apps.WaitGetDeploymentAppSucceeded(ctx, app.Name, app.ActiveDeployment.DeploymentId, 20*time.Minute, nil)
@@ -59,6 +60,7 @@ func WaitForDeploymentToComplete(ctx context.Context, w *databricks.WorkspaceCli
 	}
 
 	if app.PendingDeployment != nil &&
+		app.PendingDeployment.Status != nil &&
 		app.PendingDeployment.Status.State == sdkapps.AppDeploymentStateInProgress {
 		logProgress(ctx, "Waiting for the pending deployment to complete...")
 		_, err := w.Apps.WaitGetDeploymentAppSucceeded(ctx, app.Name, app.PendingDeployment.DeploymentId, 20*time.Minute, nil)