enable fixation only datasets

[SiQube]

eventually resolves #716

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (b392b8c) to head (caed462).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #771   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           60        61    +1     
  Lines         2817      2914   +97     
  Branches       759       779   +20     
=========================================
+ Hits          2817      2914   +97     

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[SiQube]

for pre-commit ci to pass need to merge #774 first

[SiQube]

resolves #716

[SiQube]

we have to think about integration tests when considering this feature.

we may have to add a line which checks whether has_gaze_files is true. if not true, skip test.

secondly, we may have to add integration tests, for datasets which just have has_precomputed_event_files. this might be more difficult as we do not enforce any standardized notations.

[prassepaul]

I would only change the small thing pointed out... really big PR...