deprecates integration with PHP Copy/Paste Detector (PHPCPD) library. #564

Job	Run time
CI test (make validate)	28s
Code coverage (codecov)	28s
Build moodle-plugin-ci.phar	40s
Integration tests (8.3, main)	6m 8s
Integration tests (8.2, MOODLE_403_STABLE)	5m 57s
Integration tests (8.2, MOODLE_402_STABLE)	5m 41s
Integration tests (8.1, MOODLE_401_STABLE)	6m 52s
Integration tests (8.0, MOODLE_400_STABLE)	7m 4s
Integration tests (8.0, MOODLE_311_STABLE)	6m 13s
Integration tests (7.4, MOODLE_39_STABLE)	5m 46s
Integration tests (PHAR) (8.3, main)	5m 59s
Integration tests (PHAR) (8.2, MOODLE_403_STABLE)	5m 37s
Integration tests (PHAR) (8.1, MOODLE_402_STABLE)	5m 53s
Integration tests (PHAR) (8.0, MOODLE_401_STABLE)	6m 19s
Integration tests (PHAR) (7.4, MOODLE_400_STABLE)	6m 0s
	1h 15m 5s

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