Get cloud missions dynamically and fix cloud download workflow #5181

Job	Run time
egg_info with Python 3.9	16s
OSX, py310, all optional dependencies	10m 4s
Linux ARM, py312, all optional dependencies	2m 5s
Code style checks	24s
Windows, py311, mandatory dependencies only	3m 9s
oldest version for all dependencies	1m 53s
	17m 51s

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