remove roman_datamodels from ci #188

Job	Run time
Python 3.12 Tests	42s
Python 3.11 Tests	30s
Python 3.10 Tests	32s
Python 3.9, with Code Coverage	36s
Python 3.9, Windows	1m 26s
Python 3.9, MacOS	37s
Twine	32s
Document Checks	35s
Code Style Checks	53s
ASDF Standard Document Build	51s
ASDF Document Build	56s
ASDF-transform-schemas Document Build	49s
ASDF-coordinates-schemas Document Build	39s
ASDF-wcs-schemas Document Build	39s
ASDF-astropy Document Build	55s
rad Document Build	42s
stdatamodels Document Build	1m 24s
	13m 18s

Provide feedback