Is your feature request related to a problem? Please describe.
There currently exists an unused endpoint rest-v2/manager containing JSON data about the Manager. The endpoint currently used by the front-end for Manager data is rest/manager.

Describe the solution you'd like

• Modify the front-end to expect and use the rest-v2/manager endpoint instead of rest/manager. This will involve changing the homepage table that is displayed for the Manager as well as the Manager page.
• Delete the old rest/manager endpoint

Describe alternatives you've considered
Could continue to use rest/manager endpoint and delete the rest-v2/manager endpoint, but it seems the switch to the rest-v2/manager was intended but just never complete.

Additional context
#5873 fixed an issue where the front-end was using the data at the rest-v2/manager endpoint, but the front-end had yet to be changed to support this. That PR switched back to using rest/manager for the time being, until the front-end is changed to support v2.