Don't allow inviting existing admins or invitees

[ccschmitz]

Summary

We currently allow people to send invites to existing admins and people who have already been invited to a workspace. This PR adds some validations and error handling to ensure this doesn't happen. The checks for existing emails are case-insensitive.

How did you test this change?

• Try inviting an existing admin and ensure you get an error.
• Try inviting someone who has already been invited and ensure you get an error.
• Ensure emails that don't match admins or existing invitees are created correctly.

Are there any deployment considerations?

Adds some DB load when creating a workspace invite, but only a few reads.

Does this work require review from our design team?

N/A

[linear]

HIG-4580 Member invite email is case sensitive

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Latest commit: 7d5c6d2

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[SpennyNDaJets]

Looks good! I wonder if we can also prevent null emails from being created? It doesn't send an invite, but not sure how this can be taken advantage of

[ccschmitz]

@SpennyNDaJets I added required to the input to prevent submitting empty values!