feat(@angular/build): add browserViewport option for vitest browser tests
#31348
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Introduces a new option,
browserViewport, to the unit-test builder to allow configuring the browser's viewport size during test execution.This option accepts a string in the format
widthxheight(e.g.,1280x720) and is passed to the underlying browser provider when using the Vitest runner. This is particularly useful for testing responsive layouts or ensuring components render consistently at a specific size.A warning has been added to the Karma runner to inform users that this option is not supported, preventing confusion and providing clear feedback.
Closes #31321