Phase 2| Handle update operation for DMEntity and DMAttributes

[aarshi0301]

Change description

JIRA: https://atlanhq.atlassian.net/browse/CJ-157
https://www.notion.so/atlanhq/Publish-API-1040e027187b80e5b70eea55165a255f

Type of change

• Bug fix (fixes an issue)
• New feature (adds functionality)

Related issues

Fix #1

Checklists

Development

• Lint rules pass locally
• Application changes have been tested thoroughly
• Automated tests covering modified code pass

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

Code review

• Pull request has a descriptive title and context useful to a reviewer. Screenshots or screencasts are attached as necessary
• "Ready for review" label attached and reviewers assigned
• Changes have been reviewed by at least one other contributor
• Pull request linked to task tracker where applicable