Support Emoji in Modal

Description:

In the old versions, I see the modal is able to display emoji but the latest versions, the emoji cannot be rendered in modal anymore.
So all the apps those use emoji in modal, will display plain text instead, and look really weird.

Steps to reproduce:

1. Create an app and build a modal.
2. Use addSectionBlock to add content to modal.
3. Add emoji as :rocket: to the content.
4. Modal will show the emoji as plain text.

Expected behavior:

Modal is able to display emoji instead of plain text, same as old versions.

Actual behavior:

Server Setup Information:

• Version of Rocket.Chat Server: 6.13.0
• License Type: Enterprise
• Number of Users: 50
• Operating System: Centos
• Deployment Method: Manual
• Number of Running Instances: 1
• DB Replicaset Oplog:
• NodeJS Version: 14.21
• MongoDB Version: 4.4
• App Engine: 1.46.0

Client Setup Information

• Desktop App or Browser Version: Chrome
• Operating System: MacOS

Start by reproducing the modal behavior through the addSectionBlock entry point described in the issue, using 🚀 content. Trace how the modal renders that content and compare it with the behavior in older versions. Done means the emoji renders in the modal instead of appearing as plain text.