refactor(@angular/build): create shared utility for external metadata #31735
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The logic to process external metadata from build results was previously implemented directly within the dev-server.
This commit extracts this logic into a shared utility function,
updateExternalMetadata, and moves it to a common location. The dev-server is updated to use this new function.Additionally, the Vitest unit test builder is modified to leverage this utility, allowing it to correctly track external dependencies for Vite's dependency optimization.