Implement --exclude option in phpcs command #529

Job	Run time
Code coverage (codecov)	25s
CI test (make validate)	31s
Build moodle-plugin-ci.phar	33s
Integration tests (8.2, main)	5m 22s
Integration tests (8.2, MOODLE_403_STABLE)	4m 55s
Integration tests (8.2, MOODLE_402_STABLE)	5m 14s
Integration tests (8.1, MOODLE_401_STABLE)	6m 15s
Integration tests (8.0, MOODLE_400_STABLE)	5m 50s
Integration tests (8.0, MOODLE_311_STABLE)	5m 49s
Integration tests (7.4, MOODLE_310_STABLE)	4m 57s
Integration tests (7.4, MOODLE_39_STABLE)	4m 59s
Integration tests (7.4, MOODLE_38_STABLE)	5m 5s
Integration tests (PHAR) (8.2, main)	5m 18s
Integration tests (PHAR) (8.1, MOODLE_403_STABLE)	4m 58s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	5m 48s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	5m 12s
	1h 11m 11s

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