use 422 response codes

[alexfarrill]

In this update:

• sendMail returns 422 response codes instead of 403
• change the response code from 404 to 422 if you pass an invalid template name
• the http responses for an invalid api key to use json instead of plaintext
• adds tests for the above

[vercel[bot]]

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Name	Status	Preview	Updated
mailing-dynamic-demo	✅ Ready (Inspect)	Visit Preview	Nov 29, 2022 at 10:33PM (UTC)
web-emails	✅ Ready (Inspect)	Visit Preview	Nov 29, 2022 at 10:33PM (UTC)

1 Ignored Deployment

| Name | Status | Preview | Updated | | :--- | :----- | :------ | :------ | | **web** | ⬜️ Ignored ([Inspect](https://vercel.com/sofn/web/8VxiRCYD7DHFh11k7CHYRZYjVBk4)) | | Nov 29, 2022 at 10:33PM (UTC) |