UserManagement : Sanity of existing User Mgmt Features and Fix bugs

[rajat-soda]

Issue/Feature Description:
Perform sanity of User Management Features w.r.t Admin and User Roles.
Fix any issues found.

Why this issue to fixed / feature is needed(give scenarios or use cases):

How to reproduce, in case of a bug:

Other Notes / Environment Information: (Please give the env information, log link or any useful information for this issue)

Sanity for User and Admin Roles for All the APIs [Backend CRUD, Bucket CRUD, Migration, Lifecycle, Hotpot functionality]
- Verify all the functionality for these roles
- User should have limited rights [mostly READ, Execute]