use yaml constructors for _IgnoreCustomTagsLoader #3068

Job	Run time
astropy / Load tox environments	9s
asdf / Load tox environments	10s
third-party / Load tox environments	9s
stsci / Load tox environments	6s
stsci / gwcs (ubuntu-latest)	1m 5s
stsci / roman_datamodels (ubuntu-latest)	1m 39s
stsci / stdatamodels (ubuntu-latest)	1m 57s
stsci / astrocut (ubuntu-latest)	57s
stsci / jwst (ubuntu-latest)	18m 35s
stsci / stpipe (ubuntu-latest)	43s
astropy / asdf-astropy (ubuntu-latest)	2m 27s
astropy / specutils (ubuntu-latest)	2m 9s
asdf / asdf-coordinates-schemas (ubuntu-latest)	2m 46s
asdf / asdf-wcs-schemas (ubuntu-latest)	1m 38s
asdf / asdf-zarr (ubuntu-latest)	37s
asdf / asdf-compression (ubuntu-latest)	27s
third-party / sunpy (ubuntu-latest)	2m 57s
third-party / dkist (ubuntu-latest)	3m 33s
third-party / abacusutils (ubuntu-latest)	1m 14s
	43m 18s

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