Adding level group information to site health

[dparker1005]

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Changes proposed in this Pull Request:

Adding level group information to site health.

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[kimcoleman]

This works. I wonder if we should merge the levels and level groups in Site Health. Is it easier to paste as a giant JSON into a formatter and see the level groups with levels within? I'm open to this as-is or switching it up. Do we use this formatted membershiplevels data any other way?

[dparker1005]

I'd be open to merging level groups and levels, though I'm not sure how many "levels of nesting" is too many for a single site health option. It would look better in a JSON formatter, but is more difficult to read "on the fly". I can go either way on it, and we can always change the choice down the line. Site Health is mainly for our support's use anyways