fix(ingest): Fix roll back failure when REST_API_AUTHORIZATION_ENABLED is set to true

[TonyOuyangGit]

The issue detail is in #9088
This proposed fix is to add the DELETE_ENTITY policy to the root user and Admin role so that they should be able to roll back ingestion without explicitly assigning DELETE_ENTITY to themselves when REST_API_AUTHORIZATION_ENABLED is enabled.

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues Admin user could not roll back ingestion when REST_API_AUTHORIZATION_ENABLED is set to true #9088
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub