fix(vite): default vitest provider to v8

[mandarini]

Current Behavior

vitest provider defaults to c8.

Expected Behavior

vitest generator defaults to v8. Executor should default to v8, but if c8 is installed then use c8. User can override these options in vite.config.ts.

Related Issue(s)

Fixes #18505

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 7, 2023 0:56am

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✅ Successfully ran 7 targets

• linux nx affected --target=e2e --base=bb76d01942fbf33468b19b7be3262dd8523e6390 --head=5a77b0809eee46f9b80c0648515fb95ecf7d61a9 --parallel=1
• linux nx affected --target=test --base=bb76d01942fbf33468b19b7be3262dd8523e6390 --head=5a77b0809eee46f9b80c0648515fb95ecf7d61a9 --parallel=1
• linux nx affected --target=build --base=bb76d01942fbf33468b19b7be3262dd8523e6390 --head=5a77b0809eee46f9b80c0648515fb95ecf7d61a9 --parallel=3
• linux nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• linux nx affected --target=lint --base=bb76d01942fbf33468b19b7be3262dd8523e6390 --head=5a77b0809eee46f9b80c0648515fb95ecf7d61a9 --parallel=3
• nx-cloud record -- nx format:check --base=bb76d01942fbf33468b19b7be3262dd8523e6390 --head=5a77b0809eee46f9b80c0648515fb95ecf7d61a9
• linux nx documentation --no-dte

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Sent with 💌 from NxCloud.

[ndcunningham]

LGTM

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