Batch::claimItem() is inefficient with huge data

Problem/Motivation

Batch::claimItem() contains a problem similar to #3124304: DatabaseQueue::claimItem() is inefficient with huge data.

The SQL query is extremely slow if:

• There are dozens of rows with the same name.
• The serialized data in the data field is large (~1 MB in our use case).

We noticed this when uploading a lot of images with the media_bulk_upload module.

Steps to reproduce

Proposed resolution

The solution proposed in #3124304: DatabaseQueue::claimItem() is inefficient with huge data would also work here: first fetch only the item ID, then fetch the data in a separate query.

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet