Remove deprecated code #2920

Job	Run time
astropy / Load tox environments	5s
asdf / Load tox environments	6s
third-party / Load tox environments	7s
stsci / Load tox environments	8s
astropy / asdf-astropy (ubuntu-latest)	2m 23s
astropy / specutils (ubuntu-latest)	1m 55s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 48s
asdf / asdf-coordinates-schemas (ubuntu-latest)	3m 22s
asdf / asdf-zarr (ubuntu-latest)	29s
asdf / asdf-compression (ubuntu-latest)	30s
stsci / astrocut (ubuntu-latest)	51s
stsci / gwcs (ubuntu-latest)	1m 0s
stsci / jwst (ubuntu-latest)	19m 42s
stsci / stdatamodels (ubuntu-latest)	1m 44s
stsci / stpipe (ubuntu-latest)	54s
stsci / roman_datamodels (ubuntu-latest)	1m 38s
third-party / weldx (ubuntu-latest)	1m 3s
third-party / sunpy (ubuntu-latest)	2m 55s
third-party / dkist (ubuntu-latest)	2m 35s
third-party / abacusutils (ubuntu-latest)	3m 9s
	46m 24s

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