[Java] Fix missing client data, clean up
- Remove
clientData
property fromContextController
. - Add
ClientData
parameter toEventProcessed
. - Remove
ClientData
from event serializer. - Add test to verify larger set of
ClientData
. - Remove deprecated methods from
MetricsClient
. - Update data + config fixtures to include additional contextual values to be tested.
- Update relevant tests.
Bug: T355360