META: Cleanup behat stuff

[mhsdesign]

• revert hack neos/neos-ui@103afcf
• revert hack https://github.com/neos/redirecthandler-neosadapter/pull/60/files/892f8a4e6b618d935c709103cd6ebdf5253eb504#r1354586677
• Task: minor behat test cleanup #3175
• TASK: document and deprecate flows internal isolated behat tests #3173
• TASK: remove outdated useless e2e tests neos-development-collection#4543
• TASK: Remove Neos.ContentRepository.Security neos-development-collection#4544 (cleans up also behat stuff partially)
• !!! TASK: Radical cleanup behat#35
• TASK: Use new Behat FlowBootstrapTrait neos-development-collection#4669
• TASK: Use new Behat FlowBootstrapTrait neos-development-collection#4669

public usages that we need to consider:

FlowContextTrait in every package that has behat tests:

• Flowpack.DecoupledContentStore
• Neos.RedirectHandler.NeosAdapter

Packages using "scarier" functionality:

SecurityOperationsTrait in https://github.com/Flowpack/Flowpack.DecoupledContentStore/blob/6adb8e04246f5fc9b8471b656db7ddf131474745/Tests/Behavior/Features/Bootstrap/FeatureContext.php#L49 -> requires $isolated = false

And a lot of better to be cleaned up stuff in the Neos.RedirectHandler.NeosAdapter version 9

Utility package for actual e2e tests based up on neos e2e "api"

• https://github.com/sandstorm/Sandstorm.E2ETestTools

• https://github.com/cron-eu/neos-behat/blob/cf5628722862373783827bd513d2f5af4413f524/Tests/Behat/FeatureContextBase.php#L30

[mhsdesign]

The last open task is to get rid of our @isolated stuff but thats for another time. #3170

Our behat things are now cleaned up ^^