fix(@angular/build): validate V8 coverage support for browsers in Vitest

[clydin]

This change introduces a validation check in the Vitest runner to ensure that code coverage is only enabled when using supported Chromium-based browsers. Since the Angular CLI integration currently relies exclusively on the V8 coverage provider, running tests in non-Chromium browsers like Firefox or Safari with coverage enabled would result in incomplete data or missing reports. By adding this check, developers will receive a clear, actionable error message early in the process, preventing confusion and ensuring reliable coverage reports.

[gemini-code-assist]

Code Review

This pull request introduces validation to ensure that V8 code coverage is only enabled for supported Chromium-based browsers when using the Vitest runner, and adds an E2E test to verify this behavior. A review comment identifies that the current implementation only checks the instances property from CLI options, potentially bypassing validation for browsers configured via the name property or within vitest.config.ts. A code suggestion is provided to make the validation more robust by checking these additional configuration sources.

[clydin]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 74e7dbe
• 21.2.x: 6df2b14

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