[next] feat(cypress): use vite instead of webpack

[raimund-schluessler]

This migrates the cypress tests from webpack to vite. The only component left that still uses the webpack config is the styleguide now.

@susnux I wanted to migrate cypress from webpack to vite, but I cannot seem to import the vite.config.mts file, no matter how I try (with or w/o extension, all extensions possible). Do you have any hint? Nevermind, it turns out one does not even need to explicitly import the vite config.