Allow workspaces to be created with an organization mapped agent

MR: Allow workspace creation with organization mapp... (!188260 - merged)

Description

Currently, the backend blocks the creation of workspaces with agents that do not have valid namespace mappings or violate workspace creation and agent hierarchy rules.

We would need to update this logic to permit organization-mapped agents to be used in creating a workspace.

Acceptance criteria

• Organization mapped agents are allowed to be used in creating a workspace even if they are not in the same namespace hierarchy as the workspace project

Implementation plan