Rework the way "one-time" and "monthly" are coded on our donation page

Right-now “monthly” is the default because it’s more valuable to us but it might be surprising to the user and badly interpreted, especially if overlooked.

Could we have a mechanism that forces them to make a decision, without previous default? This would require some JavaScript.

Feature Branch: web/16830-better-monthly-radio

Parent Task: #17078

Related issues

Blocked by #16189

Original created by @sajolida on 16830 (Redmine)

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