Remove Any Old Expressions from Codebase

[ada-x64]

This PR looks huge but it's actually quite small!

It does two things:

1. Datagrid was using an old-style expression when populating the view. This has been fixed.
2. I added a fixture to the playwright tests to ensure that no old-style expressions are still around.

Main changes occur in:

• tools/perspective-test/src/js/fixture.ts (adds fixture)
• rust/perspective-viewer/test/js/settings.spec.js (uses the new log tracking functionality)
• packages/perspective-viewer-datagrid/src/js/model/create.js (fixes datagrid bug)

The rest are dependency updates to use the fixture.

[ada-x64]

I've updated this PR to add a timeout configuration to the fixture. Now any function that can take a timeout option will wait for at most 5 seconds. This should save us substantial time on waitFor and other locator functions.