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This is a version of #39899 into ornl-next

)

### Description of work
Opening the new instrument view on Ubuntu (and at least some derivatives
like Pop_OS) causes a crash with the following error:
```
2025-09-03 13:16:17.207 (  16.560s) [    78C4E02E9F80]     vtkOpenGLState.cxx:1787  WARN| Hardware does not support the number of textures defined.
```

Pinning vtk to 9.4.2 solves the issue.
Needed to change qt to qt-main so that mambabuild successfully solves
the environment, otherwise fails.

Co-authored-by: James Clarke <james.clarke@stfc.ac.uk>
@peterfpeterson peterfpeterson added the ornl-next A copy of a branch into the ornl-next fork label Sep 16, 2025
@peterfpeterson peterfpeterson enabled auto-merge (squash) September 16, 2025 17:11
@peterfpeterson peterfpeterson merged commit b23c80c into mantidproject:ornl-next Sep 16, 2025
9 of 11 checks passed
@peterfpeterson peterfpeterson deleted the vtk_pin branch September 16, 2025 17:59
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