Feature: add "default level" option to the Donation amount and levels block

[glaubersilva]

Description

This PR adds a new "Default Level" property as a "Radio" setting on the side of each level input. Now is also possible to reorder the levels using the mouse to drag the items.

Affects

The Donation amount and levels block

Visuals

Testing Instructions

1. On the DONATION OPTION, set the "Multi-level Donation" value;
2. Go to the "Donation Levels" section and you could see a "Radio" setting on the side of each level;
3. Test the new controls by choosing different default levels and removing or adding new ones.

Pre-review Checklist

• Acceptance criteria satisfied and marked in related issue
• Relevant @unreleased tags included in DocBlocks
• Includes unit tests
• Reviewed by the designer (if follows a design)
• Self Review of code and UX completed

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[JasonTheAdams]

The biggest thing I'm wondering here, is if something like this would be a better UI for defining the amounts and selecting a default, than adding another dropdown.

cc: @jdghinson

[glaubersilva]

@JasonTheAdams What's the name of this component?

[jdghinson]

@JasonTheAdams The chosen option would have been effective if the default amount is visible in the form builder. However, with the radio in FFM, you can easily select it and see it correctly in the form builder. If we can make it visible like the picture below then we can go with the direction you suggested.

[glaubersilva]

@jonwaldstein Thanks for the review. I removed the selector, now we're using "Radio" settings on the side of each level to set the default one. I updated the PR description (and screenshots) with the new changes. Let me know if there is anything more.

[glaubersilva]

@jonwaldstein Thanks for the review, I implemented the useEffect and left a couple of replies to your previous comments. Let me know if there is anything more.

[JasonTheAdams]

I love it, @glaubersilva! What an improvement!