[TASK] bamboo: Include php 7.2 in test suite

Add php 7.2 to master test suite:
* pre-merge: acceptance, integration, functionals on any PHP agent 7.x
* pre-merge: distinct 7.0, 7.1, 7.2 jobs for php unit tests and php linting
* nightly: distinct 7.0, 7.1, 7.2 jobs for all tests

Change-Id: I8ad609e1cb2dc66162d642b5428bbf5a74d3bf36
Resolves: #83193
Releases: master
Reviewed-on: https://review.typo3.org/54906


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>