Refactor: replace test suite with vitest

[axe312ger]

As this is the only public repo with mocha/chai/sinon left, this moves it to the modern jest/vitest syntax.

We did the same for the sdk-core and the contentful.js --> contentful/contentful-sdk-core#438 + contentful/contentful.js#2169

• unit tests with vitest
  • no more memory overflows / timeouts
  • test time down from ~2m 36s to ~56s
• integration tests with vitest
  • no more false negatives / integration tests now pass every time (at lest as long noone else is running them at the same time)
  • test time a little up from ~7m 41s to ~11m (but as they pass all the time, its still a win!)
• run unit and integration tests in browser with vitest (only for manual execution)
• turn all tests into TypeScript
• adjusted mocked data to match TS interfaces
• small cleanups and removed outdated and unused e2e tests

[wiz-inc-38d59fb8d7]

Wiz Scan Summary

Scan Module						Total
IaC Misconfigurations	0	0	0	0	0	0
Vulnerabilities	0	0	0	0	0	0
Sensitive Data	0	0	0	0	0	0
Secrets	0	0	0	0	0	0
Total	0	0	0	0	0	0

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