codeintel: expose code intelligence config UI pages to users

Created by: Numbers88s

Description

Currently the entire code intelligence UI (save for hovers) is protected in the graphql resolver layer and the UI and displayed to site-admins only.

This PR will allow users to see uploads/indexes for repositories they can see (and if they have contributor access, allow editing).

Relevant tickets

Fixes #24744 (closed)

GIF

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