Resolve "Current organization"

What does this MR do and why?

The Organization entity will begin to scope data access for many code paths going forward. The majority of web requests will be isolated to an Organization.

Similar to current_user, this MR introduces current_organization that allows the current organization to be defined at the start of a web request or other code path such as rake or a worker. Future work will integrate setting and using the current organization - Cells - Routing: Technology (&11002 - closed)

Closes #429788 (closed)

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