Automated browser tests reference broken or missing categories

[rachel-fenichel]

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Description

The automated browser tests open all of the categories in the toolbox and drag out each block.

• There's a hard-coded list of basic categories in tests/browser/test/toolbox_drag_test.js, and it includes Colour. This category and the associated blocks have been removed from core and need to be removed from this test.
• There's a hard-coded list of test categories in the same file, including Validators. This fails because some of the validator blocks referred to now-removed fields. This has been fixed in the most recent version of dev-tools, so the solution is to update the dependency and then verify that the validators category works again.

Reproduction steps

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[johnnesky]

I addressed the problems described above, but created #8466 to track another problem I discovered in this test.