Add @vitest/coverage-v8 to vitest generator

[mpgregson]

• I'd be willing to implement this feature (contributing guide)

Description

Add support for @vitest/coverage-v8 in packages/vite/src/generators/vitest/vitest-generator.ts and default to v8

Motivation

@vitest/coverage-c8 is the current default, but this is now deprecated.

Suggested Implementation (replace c8 with v8)

Update the VitestGeneratorSchema.coverageProvider, replace 'c8' with 'v8'
Update the vitest generator so that it adds @vitest/coverage-v8 instead of @vitest/coverage-c8 to the package.json
Add vitestCoverageV8Version export to packages/vite/src/utils/versions.ts
Remove vitestCoverageC8Version export from packages/vite/src/utils/versions.ts

Alternate Implementations (add and default to v8)

Update the VitestGeneratorSchema.coverageProvider type to include 'v8'
Update the vitest generator so that it adds the correct dependency to package.json depending on the coverageProvider chosen.
Add vitestCoverageV8Version export to packages/vite/src/utils/versions.ts

[louiss0]

Glad this issue is up

[github-actions]

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