2623 20 add new sync provider change to modal

[LukeFinch]

Why does this PR exist?

Closes #2623

Sync providers list was getting too long in a dropdown menu, time to move it into a modal.

What does this pull request do?

• Moved 'add new sync provider' next to the heading – (Happy to move this back, but it feels better there for me with a long list of sync providers)
• Moved options into a modal
• Providers can have a description
• Added a 'Beta' value - shows a beta badge (reused from SecondScreen) - for some visual consistency

Testing this change

Additional Notes (if any)

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Latest commit: ffe9b1a

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