WhatsApp template message errors were not being properly handled because
the `@message instance` variable was only set in the `send_message`
method but not in `send_template`. When template sending failed, the
`handle_error` method couldn't update the message status due to the
missing @message reference, resulting in silent failures with no user
feedback.
This PR adds missing error handlers for the following channels and cases
1. WhatsApp - Generic Handlers for both Cloud and 360Dialog (Deprecated)
2. Instagram - Handler for a case where there is an HTTP error instead
of an `:error` in the 200 response
3. Facebook - Errors from the two sentry issues
([Net::OpenTimeout](https://chatwoot-p3.sentry.io/issues/6164805227) &
[JSON::ParserError](https://chatwoot-p3.sentry.io/issues/5903200786))
4. SMS: Generic handlers for Bandwidth SMS
#### Checklist
- [x] Bandwidth SMS
- [x] Whatsapp Cloud + 360 Dialog
- [x] Twilio SMS
- [x] Line
- [x] Telegram
- [x] Instagram
- [x] Facebook
- [x] GMail
- [x] 365 Mail
- [x] SMTP Mail
---------
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
