Remove the `user.permissions` field and resolve the permissions directly
from the accounts array in the user. This change ensures that the cache
or previous values from the last active account don't affect the
permissions.
In this PR:
- Remove user.permissions usage, replace it with getUserPermissions
method.
- Remove json.permissions from user.json.jbuilder
This API change sets the foundation for an upcoming frontend update, transitioning from a role-based model to a permission-based model. This new approach will determine eligibility for various actions and UI elements based on specific permissions rather than roles, enhancing flexibility and security in user access management.
