[Feature] ✨ Improve Tenant handling

**Is your feature request related to a problem? Please describe.**
`Identity` currently provides no way of managing `Tenant`s

**Describe the solution you'd like**
A client should not provide `tenantId` when handling any resource throughout the system. All resources manage by a client must be scoped to the tenant of the currently connected user.

**Describe alternatives you've considered**
N/A

**Additional context**
See .

Start by tracing the Identity and Tenant handling described in the issue; no files, tests, or entry points are named. Determine how resources currently receive tenantId and how the connected user's tenant is represented. Done means clients no longer provide tenantId and all client-managed resources are scoped to the current user's tenant.

Written by the indexing model from the issue text.