fix(ui): Paginated rows don't consistently have the same sort order

[m-rgba]

Description

To replicate:

• Sort on a row with a lot of the same values (enough for > 1 page).
• Select all.
• Paginate to page 2.
• Paginate back to page 1.
• There will be some number of rows on page 1 which aren't selected.

This is because the database does not return a stable order when multiple rows have the same sort value - each page of the pagination will push a random ordering of items within the sort set.

Places where this could be a problem would be if a user was scoring a scorer by pass/fail and annotating them - on pagination they may be presented with items already annotated, and miss others in their list.

Proposed fix:

• Appending a started_at sort as a secondary sort when needed.
• Split it to visual / functional sort model so that it'll be invisible for users.

[circle-job-mirror]

Preview this PR with FeatureBee: https://beta.wandb.ai/?betaVersion=d838ccc7a97c8cde50af125ccf4dc4433b145d06