test: migrate to Vitest

[timdeschryver]

Sorry it got soo big, most of it include:

• obviously, migrating to vitest including the code coverage
• migrate to Vitest spies
• migrate waitForAsync (deprecated) => this also means replacing subscribes to firstValueFrom
• remove zone.js dependency
• add import statements for the Vitest methods

[damienbod]

@timdeschryver Thanks, looks great. When I run, I have 8 tests failing. Same for you?

Cheers Damien

[timdeschryver]

@damienbod I noticed that the PR got merged. Did you resolve the issue?
It could be required to clear the .angular cache to resolve this.
If that's not the case, feel free to share the test cases and I'll take another look (mine are all passing).