[Bug]: Multiple output streams not supported from the diagram editor

[aaronchongth]

Before proceeding, is there an existing issue or discussion for this?

• I have done a search for similar issues and discussions.

OS and version

Ubuntu 24.04

Open-RMF installation type

Source build

Other Open-RMF installation methods

No response

Open-RMF version or commit hash

main

ROS distribution

Rolling

ROS installation type

Source build

Other ROS installation methods

No response

Package or library, if applicable

No response

Description of the bug

Streams with different names coming out of nodes are currently unsupported
Only 1 stream per node is supported at the moment

Steps to reproduce the bug

Draw up simple workflow with stream outs from nodes, the connection validation is preventing multiple stream outs.

Expected behavior

No response

Actual behavior

No response

Additional information or screenshots

No response