This change https://github.com/chatwoot/chatwoot/pull/13371 broke the
functionality. When a user replies to a WhatsApp message, the reply
context wasn't being properly stored in Chatwoot due to #13371
WhatsApp sends reply messages with a `context` field containing the
original message ID:
```json
{
"messages": [{
"context": {
"from": "phone_number",
"id": "wamid.ORIGINAL_MESSAGE_ID"
},
"from": "phone_number",
"id": "wamid.REPLY_MESSAGE_ID",
"text": { "body": "This is a reply" }
}]
}
```
However, the in_reply_to_external_id was being overridden when building
the message because content_attributes was explicitly set to either {
external_echo: true } or {}, which discarded the reply-to information.
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