Run tests as separate jobs #2220

Job	Run time
integration-test conda-store-server (integration)	13m 6s
integration-test conda-store-server (user-journey)	9m 2s
Build docker images (conda-store)	14s
Build docker images (conda-store-server)	19s
unit-test conda-store-server (ubuntu)	11m 7s
integration-test conda-store (3.8)	4m 30s
unit-test conda-store-server (macos)	27m 10s
integration-test conda-store (3.9)	4m 57s
unit-test conda-store-server (windows)	27m 8s
integration-test conda-store (3.10)	4m 51s
integration-test conda-store (3.11)	4m 23s
integration-test conda-store (3.12)	4m 37s
	1h 51m 24s

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