In Bazel, the `CI` environment variable is not set due to its hermetic nature. As a result, caching is enabled by default, which includes Vite pre-bundling. This is unnecessary in CI environments.
In some cases, this leads to errors during CI runs when the Vite build is closed or canceled prematurely, resulting in the following errors:
```
Error: R] The build was canceled
Error: R] Terminating worker thread [plugin angular-vite-optimize-deps]
```
PR Close#57863
Since v15, prod mode is handled by the CLI with the `optimization` flag. We can remove the environement files and `enableProdMode` when the tests use the CLI.
PR Close#49746
The integration test for i18n now makes use of the new extraction tooling
from the `@angular/localize` package rather than the old ViewEngine extractor.
PR Close#32912
