[ticket/11668] Run lint test at the end of the test suite

The lint test is very slow. Running it at the end should speed up the development cycle.

PHPBB3-11668
Merge remote-tracking branch 'remotes/igorw/ticket/11668' into develop-olympus

# By Igor Wiedler
# Via Igor Wiedler
* remotes/igorw/ticket/11668:
  [ticket/11668] Run lint test at the end of the test suite
Merge branch 'develop-olympus' into develop

# By Igor Wiedler
# Via Igor Wiedler (1) and Nathaniel Guse (1)
* develop-olympus:
  [ticket/11668] Run lint test at the end of the test suite

Conflicts:
	phpunit.xml.all
	phpunit.xml.dist
	phpunit.xml.functional