feat(@angular/build): add quiet option to suppress build noise in unit tests

[clydin]

The unit-test builder currently triggers a rebuild of the application on each test run in watch mode. This causes the application builder to print a full list of built files on every rebuild, which can be quite noisy and not useful during test development.

This change introduces a quiet option to the @angular/build:unit-test builder. When enabled, it suppresses the build summary and stats table from the application builder. The option defaults to true when running locally to provide a cleaner development experience, and defaults to false when running in a CI environment to ensure detailed logs are available for troubleshooting.

[gemini-code-assist]

Code Review

This pull request introduces a new quiet option to the Angular build and unit-test builders, allowing users to suppress build summary and stats table output. The option defaults to true in local environments and false in CI environments to maintain visibility during automated builds. The changes include updates to the public API, option normalization logic, and the addition of comprehensive unit tests to verify the behavior across different environments. I have no feedback to provide.

[alan-agius4]

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

• main: 0781f74

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