Update to validator with usability improvements

[jwold]

Feature description

---

Did an initial review of the validation screen, and wanted to open an issue with a number of smaller changes that we could review.

Do not alter or remove anything below. The following sections will be managed by moderators only.

Acceptance criteria

• Update the arrows to the default WordPress style (color and size) https://d.pr/i/g69Bbe
• These buttons don't dynamically update: https://d.pr/i/wB86G0
• Update "removed" statuses to be green: https://d.pr/i/ca0Elg. Note: I’m also considering an option that is more accessibility friendly, what do you think? https://d.pr/i/BEAqxW
• Sort button not sorting: https://d.pr/i/EWEzXW
• Consider updating these notifications to the kind that toggle on/off based on just pressing the info button: https://d.pr/i/XjuXHj
• Consider removing "sources", since it's not a sort type: https://d.pr/i/KKIk12.

Related to #2316

Implementation brief

QA testing instructions

Demo

Changelog entry

[jwold]

cc @kmyram on feedback for accessibility

[jwold]

cc @amedina and @westonruter for validation on the validator issues 😀

[westonruter]

@delawski This could serve as a guide for what aspects should be adjusted while porting the Validated URL screen over to use React components (#2316).