poetry: compose packageOverrides if already defined for python interpreter

The poetry package sets `packageOverrides` to force the poetry-core and poetry versions into alignment.

Unfortunately, in doing so, it replaces any _other_ overrides that may have been put in place on the interpreter at hand.

For Python 3.12, for example, the package `babel` needs to be updated to 2.13.1. Someone can reasonably use an overlay that sets `packageOverrides` for `python312` to update `babel`, and this works in almost all circumstances; however, it does _not_ work for purposes of building `poetry`, which discards any prior overrides.

This PR uses `composeManyExtensions` to combine the new `packageOverrides` needed for poetry with any prior value that may exist.

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