Warnings about workflows missing in tests because of runtime_cfg not set

[k-dominik]

The tests involving tiktorch are quite defensive - it's basically only required for these. The workflow listing of the shell (instantiated by any gui test) expects certain workflows to be there, but since the tiktorch exectable is unset - it complains.

I see two options:

1. Add a autouse fixture to all tests, that sets ilastik.config.runtime_cfg.tiktorch_executable - all tests will fail if tiktorch is not present for some reason
2. Ignore the warning in gui tests - acceptable since we don't actually test this workflow...

Originally posted by @k-dominik in https://github.com/ilastik/ilastik/issues/2992#issuecomment-2935020113

[btbest]

Nothing we can do specifically in run_gui_tests or launchShell to keep the solution near the problem?