Use installed version for package disambiguation

[Trenly]

Description of the new feature / enhancement

I'm not sure if this is a bug or a new feature, since I see some stuff happening with versions in the logs. I'm marking it as a feature for now, under the presumption that providing the user expectation of how it functions will lead to more meaningful triage and discussion.

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There are times when multiple matching packages are found, especially during upgrade or export.
One of the best examples of this is OBSProject.OBSStudio and OBSProject.OBSStudio.Pre-release
I've captured the logs of upgrade and export here

While we are waiting for #147 OBS Studio has been split into these separate packages, as have many others. The key factor here is that there are no matching versions in these two packages.

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I currently have version 27.1.3 installed on my system. Given that this version does not exist in OBSProject.OBSStudio.Pre-release, this should be a disambiguating factor which clearly points to which of the two packages I have installed

Proposed technical implementation details

If multiple matches are found for a package, get the current version the user has installed. I'll refer to this as INSALLED_VERSION for clarity.

• If INSTALLED_VERSION is unknown, do not disambiguate by version
• If INSTALLED_VERSION does not exist for any matching package identifier, do not disambiguate by version
• If INSTALLED_VERSION exists in more than one matching package identifier, do not disambiguate by version
• If INSTALLED_VERSION exists in exactly one package identifier, ensure that the disambiguation is valid, and then select the matching package identifier as correct; A warning to the user may be appropriate, to cover the edge case where the source may be missing a version