PREOPS-4838 Limiting the datetime selector’s range to those for which there are sky brightness files

[emanehab99]

Get the date range covered by SkyBrightness_Pre data files and limit date picker to this range so that user cannot select outside the values that have data

[ehneilsen]

This looks like the right basic approach, but I worry about getting the date range at the global level, rather than inside a method or function. The SkyModelPre class is is slow to instantiate, particularly when the argument to limit the initial load window is not set to something really short, and putting this at the global level means that importing the module is slowed down by this, even when the class never actually needs to be instantiated.

[emanehab99]

Thanks for the feedback @ehneilsen. I've wrapped the code in a function and rebased the branch

[codecov]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (8c7ea9e) 13.21% compared to head (8cb06dd) 13.15%.

Files	Patch %	Lines
...iew/app/scheduler_dashboard/scheduler_dashboard.py	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #67      +/-   ##
==========================================
- Coverage   13.21%   13.15%   -0.06%     
==========================================
  Files          43       43              
  Lines        3368     3375       +7     
  Branches      501      501              
==========================================
- Hits          445      444       -1     
- Misses       2914     2922       +8     
  Partials        9        9              

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[emanehab99]

@ehneilsen also fixed the tests