Use general stylelint task in grunt command #702

Job	Run time
Code coverage (codecov)	58s
CI test (make validate)	59s
Build moodle-plugin-ci.phar	37s
Integration tests (8.3, main, true)	6m 33s
Integration tests (8.3, MOODLE_404_STABLE, true)	6m 26s
Integration tests (8.2, MOODLE_403_STABLE, true)	6m 17s
Integration tests (8.2, MOODLE_402_STABLE, true)	6m 15s
Integration tests (8.1, MOODLE_401_STABLE, true)	6m 39s
Integration tests (8.0, MOODLE_400_STABLE)	5m 42s
Integration tests (8.0, MOODLE_311_STABLE)	5m 9s
Integration tests (7.4, MOODLE_39_STABLE)	5m 4s
Integration tests (PHAR) (8.3, main, true)	6m 2s
SelfUpdate tests (PHAR) (8.3)	41s
Integration tests (PHAR) (8.3, MOODLE_404_STABLE, true)	6m 20s
SelfUpdate tests (PHAR) (8.2)	35s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE, true)	5m 46s
SelfUpdate tests (PHAR) (8.1)	20s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE, true)	5m 49s
SelfUpdate tests (PHAR) (8.0)	28s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE, true)	6m 17s
SelfUpdate tests (PHAR) (7.4)	19s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 13s
	1h 28m 29s

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