EZP-30898: Dropped dependency on Installers to get InstallType

[alongosz]

Question	Answer
JIRA issue	EZP-30898
Required by	EZP-30898: Dropped CleanInstaller and cleaned up installer code ezpublish-kernel#2751 EZP-30898: Refactored EE installer DIC to use CoreInstaller ezplatform-ee-installer#58
Bug/Improvement	yes
New feature	no
Target version	master (8.0@dev) for eZ Platform v3.0 Behat tests.
BC breaks	no
Tests pass	yes
Doc needed	no

This PR drops dependency on Installer services defined in the Service Container as there's a simpler method. It's required by ezsystems/ezpublish-kernel#2751 but independent.

I've chosen this solution because I wouldn't recommend maintaining the changed list of service names as there's really no BC promise for that, nor there should be one.

I can improve this one further by moving more responsibility to InstallerType (w/ changed name and dropped abstract), if you want :)

QA

• Needs testing with all the metas (preferred manually, not all suites, just some random one to check if it works,
• Needs testing when ran from a dependency, not meta (haven't tried that 😅).

[mnocon]

Loos good!

Needs testing with all the metas (preferred manually, not all suites, just some random one to check if it works,

I've done that, works correctly.

Needs testing when ran from a dependency, not meta (haven't tried that 😅).

This PR runs AdminUI tests as a job (https://travis-ci.org/ezsystems/BehatBundle/jobs/577912992), so this is also covered

Thanks 🎉

[alongosz]

Thanks @mnocon! This PR is independent, so feel free to merge it when ready from your perspective (guessing e.g. waiting for another +1).

[alongosz]

Unfortunately with ezsystems/ezplatform-ee-installer#58 getting merged too early, I need to merge this as well to unblock CI. // cc @micszo