[Feature Request] Add 'Collapse/Show Connections' for Group Nodes

### Feature Idea

Group Nodes are very handy but most times I only use them with a small amount of nodes, sparingly, because it becomes a huge mess and takes up a lot of space depending. Sometimes I simply just want a group node of multiple buttons for toggling various things on/off inside of it, but without having it need to display every individual connection.

### Existing Solutions

rgthree's "Fast Bypasser" custom node has a right-click feature for collapsing/showing all the connections, so that the node doesn't stretch longer and longer in relation to the amount of things connected to it. This is basically the same exact thing that would be useful to Group Nodes imho, if it is possible of course.

### Other

_No response_

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*This issue is transferred from: https://github.com/comfyanonymous/ComfyUI/issues/8398*

Original issue was created by @Jatts-Art at 2025-06-03T05:29:30.000Z

┆Issue is synchronized with this [Notion page](https://www.notion.so/Issue-6420-Feature-Request-Add-Collapse-Show-Connections-for-Group-Nodes-29c6d73d3650812fb87ac2c55e56cda5) by [Unito](https://www.unito.io)