fix(vitest-angular): add check for nx inside generator

[luishcastroc]

• Add check for Nx version inside the setup-vitest generator to add proper dependencies.
• Add test for the generator

PR Checklist

Closes #1630

What is the new behavior?

generator adds Vite 5/Vitest 3 if Nx version is prior to 20.5

Does this PR introduce a breaking change?

• Yes
• No

Other information

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[brandonroberts]

🚀