supabase / gotrue / 6477400942

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fix: preserve backward compatibility with Twilio Existing API (#1260)

## What kind of change does this PR introduce?

Twilio has come back with clarification that Legacy WhatsApp Template
can contain compliant authentication template

> The compliant authentication template format is supported in Content
API, Content Editor and Legacy WhatsApp Templates.

> Legacy Templates: Support for basic authentication message only.

This means that we'd have to preserve support for messages which don't
include ContentSid/ContentVariables. Namely this would be messages which
are using the Legacy WhatsApp template with the message: `*{{1}}* is
your verification code. For your security, do not share this code.` . It
seems like anything else will be rejected.

Full article:
https://support.twilio.com/hc/en-us/articles/15596541039771-New-WhatsApp-Authentication-Template-Requirements-May-2023

<img width="673" alt="CleanShot 2023-10-10 at 23 30 08@2x"
src="https://github.com/supabase/gotrue/assets/8011761/c8028671-9b91-484e-9223-15da25eddfa6">

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Co-authored-by: joel@joellee.org <joel@joellee.org>

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