Investigate searching all files in new VSCode Web IDE

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Description

Currently, in the @gitlab/web-ide package, it is only possible to search based on files that are already opened. This isn't surprising because we do not load all content right away.

Let's investigate some ways we could enable client-only project-wide searching.

• Maybe we should download a highly compressed archive of all the file content? That's still a lot to hold onto in memory...
• Maybe we could collaborate with the Search team on how we can hit an endpoint that can search code matches based on a ref?