Improve in-project code search

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Problem to solve

Searching for code within a project is challenging, and we now also have higher quality code search in wide Beta on dot-com, which is not yet integrated throughout the product.

Proposal

Make it more obvious that you can search the contents of a repository in a project. One proposal that a couple of customers have suggested is adding a search bar near the top of the repository contents panel on the project page and the repository. It makes it clear you can search the contents of the repo in their entirety.

Advanced Search can handle the backend request for this, either using Elasticsearch or Zoekt, depending on which is enabled.

Edited by 🤖 GitLab Bot 🤖