This should fix the broken automapping configuration for bundles that use annotations and attributes, see#44355 for additional details.

When using the newer bundle directory structure conventions, especially with theBundle::getPath() method overridden to point the bundle root path to the Bundle class' parent directory, the issue comes up because the bundle filesystem root path does not match the root path for the actual bundle code (effectively the PSR-4 root path).

To fix automapping, theAbstractDoctrineExtension::detectMetadataDriver() method will be called a second time with the Bundle classpath if the first call (which is effectively the same asBundle::getPath()) can't resolve the appropriate mapping type. This will also update setting$bundleConfig['dir'] for drivers that are based on PHP classes so that the root path is based on the bundle classpath (AKA the PSR-4 root path) instead of the bundle path.

The bulk of this patch is mainly from adding test fixture bundles to be able to test theAbstractDoctrineExtension::getMappingDriverBundleConfigDefaults() method in this repo and ensuring that the metadata driver detection works right for all of the supported drivers.