chore(ci): run separate tests for each service in isolation #245

Job	Run time
Unit tests on nightly --no-default-features	39s
Unit tests on stable --no-default-features	33s
Unit tests on stable	44s
Formatting	5s
Unit tests for compute	38s
Unit tests on 1.76.0	13s
Unit tests for baremetal	42s
Unit tests for identity	34s
Unit tests for block-storage	41s
Unit tests for image	37s
Unit tests on 1.76.0 --no-default-features	13s
Unit tests for rustls	38s
Unit tests on nightly	51s
Documentation	1m 23s
Unit tests for object-storage	45s
Unit tests for network	35s
	9m 51s

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