[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
[develop-olympus] Bumping version numbers to final for 3.0.12 releases.
[develop-olympus] Bump version numbers for 3.0.12-RC1 release.
[develop-olympus] Add changelog for 3.0.12 release.
[develop-olympus] Increment version number to 3.0.13-dev.