Add Yandex.com as a search engine

[bsclifton]

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Fixes #2703

Also includes

• small refactor in js/components/urlBar.js which should make future changes easier (and opens this up to unit testing)
• removes permafail webdriver test that should have been removed with Add default icon for url that has a broken file #5826 (I missed the fact CI failed on this when reviewing)

This does not include search suggestions; I broke that out and captured with #5963

Auditors: @bbondy, @cezaraugusto

Test Plan

1. Launch Brave and open Preferences
2. Set Yandex as your default search engine
3. Search in the omnibox, confirm it shows results on yandex.com
4. Check the URL that was created; client ID (clid=) should be:

• 2274777 on Windows
• 2274776 on macOS
• 2274778 on linux

5. Try the search engine shortcut, :ya and do a search in the omnibox

[cezaraugusto]

LGTM

[bbondy]

++ please rebase and then merge @bsclifton