Test new cell execution UI hints

[roblourens]

Refs: #130611

• macOS @kimadeline
• linux @JacksonKearl
• windows @chrmarti

Complexity: 3

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This feature was 3 changes:

• When no executing cell is scrolled into view, the editor-level progress bar will be visible
• A "Go To Executing Cell" button has been added to the notebook toolbar, when the cell is executing
• When a cell is executing, it gets an animated 🔄 icon where it appears in the breadcrumbs and outline (enable notebook.outline.showCodeCells to see this)

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• Test that these all work as expected
• The editor progress bar is hidden and shown when clicking from the notebook to another editor, back to the notebook, while a cell is still executing
• The animations never get stuck showing when a cell is not actually executing
• For 🌟 bonus points 🌟 , test this with Jupyter debugging. Setup steps here. The animations should not animate when a cell is paused in the debugger.

[JacksonKearl]

Works well! Noticed some weird things with multiple cells running at once, I didn't realize Jupyter doesn't actually support that. But it'd be nice to have for Handy.

[kimadeline]

Looks good to me! Only noticed a couple of small details, sadly I couldn't get the debugging to work (seems like it's because I'm using the latest ipykernel) 😔