feat: transform email to lower case before being passed in auth & che…

[evanyang1]

Fixes #1464

We pass in the lowercase email into checkUser and checkAuth

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[trillium]

Great work, thanks Evan!

This pull request is a part of a larger batch here.

We need to hold off on merging this pull request until the rest of the db login things are done.

[JackHaeg]

• The backend portion of this ticket is being addressed by #1551