BRMS and Fuse examples should be hidden if Integration Stack is not available

For BRMS and Fuse examples, the connectors requirements would let a user believe the proper features can be installed, but this is only true if the integration stack is available. If it's not, then an error would pop up as the missing connectors would not be installable.

We could check if jboss.discovery.site.integration-stack.url is empty and hide all examples containing a BRMS or FUSE tag