Add more UI tests for the debugger

[jtpio]

References

Follow-up to #10359

Code changes

There has been a couple of visual regression for the debugger in the past (breakpoints or variables not showing).

TODO

• Open the debugger sidebar
• Start and stop the debugger
• Screenshot of the sidebar
• Screenshot of the variable explorer (tree and grid views)

This change adds a couple more UI tests for the debugger, as well as reference screenshots for the debugger sidebar such as the following:

Ideally, new visual tests will be added alongside new features in the future.

User-facing changes

None

Backwards-incompatible changes

None

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[jtpio]

Some of the UI interactions could also be implemented in galata, under a new debugger namespace.

[jtpio]

Also we can limit the scope of this PR to the basic debugger elements.

And expand on it incrementally in other PRs, with more complex interactivity like clicking on a breakpoint and opening the notebook or read only file.

[jtpio]

Closing as the structure of the UI tests has changed in the meantime with the Galata incorporation: #10796

Tracking in this issue instead: #11042