DIGITAL-488: Removes body field from authors, landing page and topics

[nick-mon1]

Jira ticket

DIGITAL-488

Purpose

This removes the body field from authors, landing pages and topics since they are not used and could lead to confusion for content creators.

Includes the following PRs that must be merged first

Deployment and testing

Local Setup

QA/Testing instructions

1. Visit an existing author, landing page and topics content node and should not see body field
2. Create a new content type for author, landing page and topics and should not see body field

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.