[BUG] Fields content in attachments does not render Markdown

[aKn1ghtOut]

Description:

On Web client:

On App:

Environment Information:

• Rocket.Chat Server Version: 3.11
• Rocket.Chat App Version: 4.14.1
• Device Name: Nexus 6P
• OS Version: Android 11

Steps to reproduce:

Send a message with field attachment:
"fields": [{"short": true,"title": "Test","value": "Testing out something or other"},{"short": true,"title": "Another Test","value": "[Link](https://google.com/) something and this and that."}]

Expected behavior:

Markdown to render

Actual behavior:

Shown as plain text

Additional context:

Fix PR ready