[BE Feat] Create verification email redirect views

[SherRao]

Checklist

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• Is labelled properly - if this is a refactor, add the label!
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Description

When the user registers and gets sent an email, that email will contain a link to click. Once you click the link, one of three views will be shown:

• Successfully verified view: Use when user clicks on link in verification email.
• Already verified view: Use when user clicks on an old link and they have been verified already.
• Failed verification view: Use when the server fails to verify the user's email.