Web client: Add tests for the basic matrix functionality

Problem

While solving #170 we got blocked on #173 and therefor instead used a simple UI to get #170 done.

Goal

We want automated UI tests for the matrix functions

ACs

  • A playwright test is set up for the MainView component
  • A playwright test is set up for the Login component
  • A playwright test is set up for the Logout component
  • A playwright test is set up for the Anträge component

Notes/ resources

Who needs to be involved / informed