feat(adminPanel): RN-1509: Viz builder user permissions

[tcaiger]

Issue #: RN-1509: Viz builder user permissions

The permission group for controlling viz builder access is called Viz Builder User. It is already in the database from the last time this feature was added so no manual step is required to add it.

Changes:

Add Viz Builder User permission check to the following places:

• the add dashboard item button in the dashboard items tab and map overlays tab
• the edit using Visualisation Builder button on the dashboard item or map overlay edit modal
• the viz builder front end route
• the create and edit map overlay and dashboard item visuals api handlers in central-server

[rohan-bes]

Looks good! Nice work