Fix confusing "role" field on user edit form

[seancolsen]

⚠️ Stacked on #4031

Fixes #4068

Before	After

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• My pull request has a descriptive title (not a vague title like Update index.md).
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[seancolsen]

@ghislaineguerin you might like to read over this PR description as well, since this PR slightly modifies the UX here. Let me know if you have any concerns with this.

[seancolsen]

@pavish note that this is stacked on #4031 which I don't expect to be merged soon. Please review this PR, but don't merge it yet.

[pavish]

Code looks good. I have one comment on the help text.

[pavish]

A user's admin status does not affect their access to the data within the connected databases.

This text might end up misleading the user. An admin can modify their own access (and the access of others) to connected databases. So, the admin status does affect the access to the data within the connected databases.