Backport PR #3319 on branch v4.0.x (Respect loaded mask cube properly in spectral extraction.) #11113

Job	Run time
Code style checks	15s
PEP 517	24s
Security audit	20s
Python 3.11 with coverage checking, all deps, and remote data	17m 38s
OS X - Python 3.12	5m 36s
Windows - Python 3.10	13m 53s
Python 3.12 with latest dev versions of key dependencies, and remote data	28m 2s
Upload Coverage	7s
	1h 6m 15s

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