fix(vite-plugin-angular): fix optimization bug with bundles w/o side effects

[brandonroberts]

PR Checklist

Closes #

What is the new behavior?

Noticed a bug where a minimal build using Zoneless/Vite was 222kb vs Angular CLI build was 99kb. Packages with no side effects were being processed correctly. This ensures the same optimization happens and reduces the bundle size.

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

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