Visualisation enhancements follow-up

This issue is a follow-up to https://github.com/galaxyproject/galaxy/pull/20097 and I think we can crowd-source this a bit for new contributors.

## No example data

* [x] Cytoscape no example data
* [ ] FITS Graph Displays FITS Tables
* [ ] H5web
* [ ] Image Annotate Display and Annotate Images
* [ ] OpenLayers (similar data like Kepler?)
* [ ] Tiff Viewer
* [ ] Venn Diagram
* [ ] Vitessce
* [ ] Vizarr Viewer
* [x] RNA Structure Viewer

## Missing help

* [ ] aequatus
* [ ] ChiRAViz
* [x] CSG Viewer <-- hide/remove, this is replaced by VTK
* [x] Graph Visualization <--- hide/removed? We have Cyctoscape now and that one was based on Cytoscape?
* [ ] PCA 3D plot
* [x] RNA Structure Viewer

## Some general issues

* [ ] export button inside the text-editor should block if one export is running, otherwise multiple exports can be triggered simulanously
* [ ] image annotate needs an export button
* [x] Kepler is displaying CSVs which is most of the times wrong
* [x] The dataset selector is not displaying the HDA ID?
* [ ] for Vizarr / Vitessce it would be nice to test external data - they can in theory work with URLs and deferred data
* [ ] Trackster should be hidden?
* [x] MSA is showing way too many different datatypes in the data select

## General feature requests
* [ ] copy link feature like in tools to point someone to a Vis
* [ ] It would be nice if we can add custom "maps" to either Openlayers or Kepler. With custom maps we could display geojson of annotations, e.g. Tumors on a kidney or liver. We have tools that create such geojsons.

The issue names no files, tests, or entry points; start by choosing one unchecked visualization task and locating the corresponding Galaxy component. Define completion for that task before implementing it, and verify that the selected checklist item is addressed.

Written by the indexing model from the issue text.