Stryker init with vue should now use "vitest"

[nicojs]

Is your feature request related to a problem? Please describe.
Currently, the Vue initializer uses jest. It was based on vue 2 projects.

https://github.com/stryker-mutator/stryker-js/blob/master/packages/core/src/initializer/custom-initializers/vue-js-initializer.ts#L15-L25

Describe the solution you'd like

We should migrate to vitest. It should work out-of-the-box with vue projects that are created using the guide on their site.

Describe alternatives you've considered

Additional context

We also have 2 vue e2e tests that should be updated in the same PR.

[nicojs]

Released in 7.1