test(@angular/build): robustly install @angular/animations in e2e test

[clydin]

Enhance the animations package installation in the E2E test to support snapshot E2E runs by resolving the exact dependency specifier from the ng-snapshot manifest when --ng-snapshots is active. Otherwise, it reads the full installed version of @angular/core directly from the local node_modules to avoid semver issues during package installation.

[gemini-code-assist]

Code Review

This pull request updates the chunk-optimizer-animations E2E test to support Angular snapshot builds by dynamically determining the @angular/animations version based on the environment. A review comment suggests moving the snapshot manifest requirement inside the conditional block to prevent potential runtime errors in environments where the snapshot directory is absent.

[alan-agius4]

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

• main: 7a0638f

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