Move get_associated_calibration out of astrodata.

[KathleenLabrie]

DRAGONS does not expect it to be there anymore. It has been moved to the one module that needs it.

[codecov]

Codecov Report

❌ Patch coverage is 21.05263% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.75%. Comparing base (f9bb8c3) to head (95ae5b8).

Files with missing lines	Patch %	Lines
recipe_system/testing.py	21.05%	15 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #525   +/-   ##
=======================================
  Coverage   46.75%   46.75%           
=======================================
  Files         742      742           
  Lines       92064    92064           
=======================================
  Hits        43040    43040           
  Misses      49024    49024           

Flag	Coverage Δ
f2	28.32% <ø> (ø)
ghost	28.71% <ø> (ø)
ghost_integ	29.57% <ø> (ø)
gmos	28.67% <ø> (ø)
gmosls	34.20% <ø> (ø)
gnirs	29.81% <ø> (ø)
gsaoi	23.35% <ø> (ø)
igrins2	32.38% <21.05%> (ø)
niri	26.76% <ø> (ø)
regression	31.54% <ø> (ø)
slow	42.00% <ø> (ø)
unit	46.56% <ø> (ø)
wavecal	24.35% <ø> (ø)

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