fix: Filter kiali graph data with servcie app label

Created by: leoendless

Signed-off-by: leoliu leoliu@yunify.com

What type of PR is this?

What this PR does / why we need it:

The console filtered the kiali graph data with the services' names and the nodes' app value. That should be changed to services' metadata.labels.app.

Which issue(s) this PR fixes:

Fixes #

Special notes for reviewers:

Additional documentation, usage docs, etc.: