Remove the `label_ids` param from the Task By type endpoint

When the label_names parameter (!94791 (merged)) is released, the next release can phase out the label_ids parameter.

How:

• Remove the label_ids param from Groups::Analytics::TasksByTypeController
• Remove the label_ids param from Gitlab::Analytics::TypeOfWork::TasksByType
• Double-check with the frontend to ensure that the param is not used.