Organizations are public

What does this MR do and why?

Organizations are public as described by the Organization blueprint:

Visibility. Initially, Organizations can only be public. Public Organizations can be seen by everyone. They can contain public and private Groups and Projects.

In this MR we remove authorization constraints to view the Organization.

This work is behind the ui_for_organizations feature flag.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #421857 (closed)