Gui fixes

[marcelldls]

Fixes:

• Gui not being generated
• Epics gui create output path if not exists

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 87.71%. Comparing base (57316cd) to head (d051427).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fastcs/launch.py	0.00%	1 Missing ⚠️
src/fastcs/transport/epics/gui.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   87.77%   87.71%   -0.07%     
==========================================
  Files          31       31              
  Lines        1342     1343       +1     
==========================================
  Hits         1178     1178              
- Misses        164      165       +1     

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