Add tables and models for storing Isolation status

What does this MR do and why?

Add tables and models for storing Isolation status

This is needed for:

• Promoting a group to an Organization
• Migrating an organization to another cell

Changelog: added

In a follow up MR, this code will be used to add methods for Namespace and Organizations::Organization models.

This MR is split from !206304 (closed) Thanks @alexpooley for the work.

References

Related to #572150 (closed)

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