feat: test saved tokens

[gikf]

• I have read Chapter's contributing guidelines.
• My pull request has a descriptive title (not a vague title like Update README.md).
• My pull request targets the main branch of Chapter.

Ref #1885

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• Adds ability to run test on saved (valid so far) tokens, via button in dashboard/calendar.
• So far test tries to obtain from api calendarList.
• Draft mainly because there's currently awkwardness while ensuring all valid tokens are tested, and the right token would be marked as invalid, if it fails. And as usual I'm a bit confused with the async looping.

[ghost]

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[gikf]

@ojeytonwilliams Thanks, that makes things clearer and simpler.

[ojeytonwilliams]

In case you're interested, I came across the 'trick' of avoiding naming things from Brian Will's youtube channel: https://www.youtube.com/@briantwill I forget which exactly which video, I'm afraid, but the channel as a whole is great.

Anyways, thanks for making those changes!

[gikf]

Thanks, I think I found that portion in https://www.youtube.com/watch?v=2-G5WTghjYk avoid naming as much as possible. Other interesting insights as well 🚀