test(entity): refactor to Vitest type tests

[timdeschryver]

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• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
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[ ] Build related changes
[ ] CI related changes
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What is the current behavior?

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What is the new behavior?

Does this PR introduce a breaking change?

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[ ] No

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