Rework cypress commands

[juliusknorr]

This is a set of changes to cypress commands that should increase stability over CI runs. There still seem to be rare failures where some requests return a 401 on the backend which I'm continuing to follow debugging in #4350 however I think this would already be good to get in fast:

• Move from axios usage to cy.request as I suspect that the axios promise was sometimes causing timing issues with requests
• Use cy.selectFile instead of the 3rdparty helper
• Rework recovery after lost connection test to await the session recreation
• Avoid some extra navigation steps

[cypress]

Passing run #10618 ↗︎

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Details:

Rework cypress commands
Project: Text	Commit: 33372da141
Status: Passed	Duration: 06:42 💡
Started: Jun 26, 2023 10:57 AM	Ended: Jun 26, 2023 11:04 AM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[mejo-]

Thanks a ton for looking into this @juliushaertl! All changes look good, just the first commit message seems to be wrong and a bit cluttered.

[juliusknorr]

Cleaned up the commit messages :)