Remove deprecated code #2939

Job	Run time
third-party / Load tox environments	5s
astropy / Load tox environments	5s
stsci / Load tox environments	4s
asdf / Load tox environments	5s
stsci / astrocut (ubuntu-latest)	56s
stsci / gwcs (ubuntu-latest)	1m 3s
stsci / jwst (ubuntu-latest)	12m 27s
stsci / stdatamodels (ubuntu-latest)	2m 2s
stsci / stpipe (ubuntu-latest)	43s
stsci / roman_datamodels (ubuntu-latest)	1m 33s
astropy / asdf-astropy (ubuntu-latest)	2m 29s
astropy / specutils (ubuntu-latest)	1m 50s
third-party / weldx (ubuntu-latest)	1m 1s
third-party / sunpy (ubuntu-latest)	3m 3s
third-party / dkist (ubuntu-latest)	2m 35s
third-party / abacusutils (ubuntu-latest)	2m 46s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 40s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 29s
asdf / asdf-zarr (ubuntu-latest)	34s
asdf / asdf-compression (ubuntu-latest)	50s
	39m 20s

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