batch changes: Fix percy snapshots in batch integration tests

Created by: fkling

While working on search integration tests I noticed this warning:

[percy] Encountered an error uploading snapshot: Batch change details page - dark theme [percy] Error: The name of each snapshot must be unique, and this name already exists in the build: 'Batch change details page - dark theme' -- You can fix this by passing a 'name' param when creating the snapshot. See the docs for more info on identifying snapshots for your specific client: https://percy.io/docs

This PR should resolve that issue.

Test plan

CI

App preview:

• Web
• Storybook

Check out the client app preview documentation to learn more.