Add function to get installed prerelease packages #1114

Job	Run time
unit_tests (3.7)	2m 56s
unit_tests (3.7)	3m 26s
skill_object_tests (3.7)	1m 53s
skill_object_tests (3.7)	1m 53s
unit_tests (3.8)	2m 45s
unit_tests (3.8)	3m 8s
skill_object_tests (3.8)	1m 48s
skill_object_tests (3.8)	1m 48s
unit_tests (3.9)	2m 50s
unit_tests (3.9)	3m 18s
unit_tests (3.10)	3m 1s
unit_tests (3.10)	3m 25s
skill_object_tests (3.9)	1m 54s
skill_object_tests (3.9)	1m 54s
skill_object_tests (3.10)	1m 57s
skill_object_tests (3.10)	1m 57s
py_build_tests / relative_path_tests	7s
py_build_tests / relative_path_tests	7s
py_build_tests / py_build_tests	5s
py_build_tests / py_build_tests	5s
	40m 17s

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