Feat: Use Maestro for application testing

[andreped]

Is your feature request related to a problem? Please describe.
Right now, when making new releases or pushing to the main branch, we have no way of testing if it breaks any behaviour. We should implements tests to make sure our release pipeline is robust and that the main branch remains stable.

Describe the solution you'd like
maestro seems like the best candidate, as recommended in microsoft/playwright#26587 (comment).

Describe alternatives you've considered

• Flutter has a built-in solution for doing tests, but it is dogshit, sadly.
• I looked into using playwright, but it looks like they do not support Flutter.