Global organization route prefix

What does this MR do and why?

This MR will dynamically route any path received with a URL path of /o/my-org/<some-path> to a path of <some-path>. The X-Gitlab-Organization-ID header will be set as the ID of the Organization with the matching my-org path.

We start at !209311 (diffs) routes and pass to !209311 (diffs) where we essentially query the routes for the non-org scoped route and then forward through.

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Before	After

How to set up and validate locally

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