add get_subsets_as_regions method to subset plugin, deprecate get_interactive_regions and get_spectral_regions #11154

Job	Run time
Code style checks	17s
Code style checks	17s
PEP 517	20s
PEP 517	20s
Security audit	17s
Security audit	17s
Python 3.11 with coverage checking, all deps, and remote data	36m 39s
Python 3.11 with coverage checking, all deps, and remote data	36m 39s
OS X - Python 3.12	10m 54s
OS X - Python 3.12	10m 54s
Windows - Python 3.10	24m 35s
Windows - Python 3.10	24m 35s
Python 3.12 with latest dev versions of key dependencies, and remote data	31m 19s
Python 3.12 with latest dev versions of key dependencies, and remote data	31m 19s
Python 3.11 with stable versions of dependencies and Roman	16m 10s
Python 3.11 with stable versions of dependencies and Roman	16m 10s
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Upload Coverage	6s
	4h 1m 13s

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