Revert "Implement colocated mapping driver"

[greg0ire]

This reverts commit cd57768.
The BC-break that was assumed to be harmless is in fact causing bugs in
the laminas integration.

A more involving but less BC-breaking upgrade path should be found later on.

doctrine/DoctrineModule#774

[greg0ire]

Argh… this is not as easy as it looks, because now we support doctrine/persistence 3, and it no longer has this class. I might work on a conditional class definition later on, but this will be ugly 🙈

It could look like this:

if (class_exists(PersistenceAnnotationDriver::class)) {
  previous code
} else {
  code with the BC break
}

[derrabus]

See #9671 for an alternative.

[derrabus]

Closing in favor of #9671.