Provide a way to show dependencies are being indexed and will appear later after scip upload

Created by: ckipp01

Feature request description

The example I'll give is using a Scala repository that uploads a scip index with external maven artifacts mentioned that should also be indexed.

I'd be great when you do a scip upload and you have dependencies that will be indexed because they're mentioned in the index.scip file that you'd be notified that deps are detected, and that indexing is in progress.

Here's a snapshot of the page and the area circled that it'd be helpful to have some sort of progress notification.

You should also be able to view this page by going here.

Is your feature request related to a problem? If so, please describe.

This is more of an improvement than anything, but currently when you do an upload of a project, the amount of dependencies that you may expect to show probably won't be there right away. For example, when I first uploaded this project and checked the status I saw that everything was 🟢 , but I only saw 4 dependencies listed, when I knew I should have more than that. This caused me to think something was wrong either with my upload or with Sourcegraph, and I commented in the Sourcegraph Discord about it. However, now if you view this page you'll notice I have 9 dependencies listed. I'm assuming that's because the versions of some of the depenencies I was using weren't indexed before, then auto-indexing of the maven artifacts happened, and after they were indexed, they appeared there. So if I was able to see that new dependencies were detected and needed to index, I wouldn't have been worried that something was wrong or commented in a support channel about this.

Describe alternatives you've considered.

I haven't really thought of any good alternative. This sort of assumes some knowledge of how the system works. I knew that maybe that was the case because @Strum355 is great and answers all my questions, but I think the average user (myself included if not for Noah) would have been totally lost and confused about why my dependencies weren't showing up.