Debugger page should have some indication of when a file is loading

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#5,711 opened on Apr 24, 2023 0 comments 0 reactions 0 assignees View on GitHub

cost: low P3 screen: debugger

Description

Broken out from https://github.com/flutter/devtools/issues/5703, find repro steps there

![switching files](https://user-images.githubusercontent.com/21270878/234135234-601bc056-29ef-4f8c-b81a-9e5b1b1693f8.gif)

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