Enable project isolation. #513

Job	Run time
Checks (unit tests, static analysis, plugin validations and binary compatibility API check)	1m 3s
Functional tests (7.3.1)	1m 2s
Assemble	49s
Functional tests (7.4.2)	1m 11s
Functional tests (8.0.2)	1m 3s
Functional tests (8.1.4)	1m 4s
Functional tests (8.2.2)	50s
Functional tests (8.3.2)	1m 19s
Functional tests (8.4.2)	1m 4s
Functional tests (8.5.2)	1m 3s
Functional tests (8.6.0-rc01)	1m 5s
Functional tests (8.7.0-alpha07)	1m 15s
Deploy snapshot	57s
	13m 45s

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