Update formentry app to use new admin extension points

The extension point on the configure metadata page from the coreapps module was changed, the extension point was split into 2 separate ones org.openmrs.module.coreapps.adminGroups and org.openmrs.module.coreapps.adminLinks, the extensions added to the first one extension point are the groupings while those attached to the second are the actual links. The formentry_app.json file in the reference application module is what needs to be updated to use these new twin extensions

Dev Notes

When this ticket will be done the test: https://github.com/openmrs/openmrs-distro-referenceapplication/blob/master/ui-tests/src/test/java/org/openmrs/reference/AddFormTest.java
https://github.com/openmrs/openmrs-distro-referenceapplication/blob/master/ui-tests/src/test/java/org/openmrs/reference/DeleteFormTest.java
https://github.com/openmrs/openmrs-distro-referenceapplication/blob/master/ui-tests/src/test/java/org/openmrs/reference/EditFormTest.java
should be restored