`ng add` does not respect version tags on repeat calls

[filipesilva]

This issue impacts 9.0.0-rc.0 and happened while updating https://github.com/SAP/cloud-commerce-spartacus-storefront.

Attempting to use ng add package-name@version after a failed ng add package-name (such as #16028) will not use the selected version. It will instead attempt to re-add the already installed package.

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