Improve the list of manual tests and in-test navigation

[oleq]

📝 Provide a description of the improvement

I noticed several issues with our manual tests and I propose several improvements:

There's no easy way to go back to the list of tests with the collapsed sidebar

ATM if you work with the collapsed sidebar (and we usually do because we use MTs as development sandboxes) you have to expand the sidebar and click the link. This is annoying and even more so on mobile devices. I propose a new button + the revamped toggle sidebar button:

Clicking a test on the list requires precision

If you open tests 5 times a day, that's OK. If you do this 200 times, things start to get annoying. I propose full-width links to tests with hover effect for clarity.

Test names in the list are cluttered

We use a RegExp to extract test names but it got neglected/forgotten (there are no tests for the list BTW) when new packages arrived in external/. And this results in:

which is ridiculous to look at and search in. I propose the new cleaner look of the list:

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