Migrate example-app tests to Vitest

[timdeschryver]

Information

Migrate example-app unit tests from Jest to Vitest.

👉 Package location: https://github.com/ngrx/platform/tree/main/projects/example-app
💡 Unit tests from the @ngrx/signals package have already been migrated to Vitest: https://github.com/ngrx/platform/tree/main/modules/signals

Documentation page

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I would be willing to submit a PR to fix this issue

• Yes
• No