Ensure PHAR self-update tests happen after the PHAR is built #629

Job	Run time
CI test (make validate)	1m 1s
Code coverage (codecov)	1m 0s
Build moodle-plugin-ci.phar	26s
Integration tests (8.3, main)	6m 18s
Integration tests (8.2, MOODLE_403_STABLE)	5m 59s
Integration tests (8.2, MOODLE_402_STABLE)	5m 38s
Integration tests (8.1, MOODLE_401_STABLE)	6m 45s
Integration tests (8.0, MOODLE_400_STABLE)	6m 31s
Integration tests (8.0, MOODLE_311_STABLE)	5m 48s
Integration tests (7.4, MOODLE_39_STABLE)	5m 41s
SelfUpdate tests (PHAR) (8.3)	30s
Integration tests (PHAR) (8.3, main)	5m 51s
SelfUpdate tests (PHAR) (8.2)	41s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE)	5m 30s
SelfUpdate tests (PHAR) (8.1)	30s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	5m 36s
SelfUpdate tests (PHAR) (8.0)	18s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	6m 20s
SelfUpdate tests (PHAR) (7.4)	9s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 33s
	1h 16m 5s

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