VOTE-2380: Only allow 'image' as embedded option in WYSIWYG

[mlloydbixal]

Jira ticket

VOTE-2341

Description

Remove the ability to embed audio, document, icon and video from the wysiwyg. Only image is available.

Deployment and testing

QA/Testing instructions

1. Pull up any wysiwyg editor and confirm only image media type is available to embed

Before

Now

Checklist for the Developer

• A link to the JIRA ticket has been included above.
• No merge conflicts exist with the target branch.
• Automated tests have passed on this PR.
• A reviewer has been designated.
• Deployment and testing steps have been documented above, if applicable.

Checklist for the Peer Reviewers

• The file changes are relevant to the task objective.
• Code is readable and includes appropriate commenting.
• Code standards and best practices are followed.
• QA/Test steps were successfully completed, if applicable.
• Applicable logs are free of errors.