fix(@angular/build): explicitly fail when using Vitest runtime mocking #32443
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The Angular unit-test builder pre-bundles tests, which prevents Vitest's runtime mocking features (like `vi.mock`) from working correctly as they rely on module graph manipulation that occurs before bundling. To prevent confusion and silent failures, a patch is now injected that causes `vi.mock` and related methods to throw a descriptive error explaining the limitation and suggesting the use of Angular TestBed for mocking instead. Fixes angular#31609
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The Angular unit-test builder pre-bundles tests, which prevents Vitest's runtime mocking features (like
vi.mock) from working correctly as they rely on module graph manipulation that occurs before bundling. To prevent confusion and silent failures, a patch is now injected that causesvi.mockand related methods to throw a descriptive error explaining the limitation and suggesting the use of Angular TestBed for mocking instead.Closes #31609