Fix Linux installer dependency versioning

[JunTaoLuo]

Fixes ingestion issue in dotnet/installer#8235

The error there was:

  dpkg: dependency problems prevent configuration of aspnetcore-targeting-pack-5.0:
   aspnetcore-targeting-pack-5.0 depends on dotnet-targeting-pack-5.0 (>= 6.0.0~alpha.1.20428.2); however:
    Package dotnet-targeting-pack-5.0 is not installed.

This is because we assume that the major.minor between aspnetcore and dotnet-targeting-pack or dotnet-runtime-pack are always aligned. This is not the case in the master branch at the moment since our branding update PR is still in progress. Nevertheless, we should never make that assumption and calculate the major.minor version of the runtime dependencies instead.

[ghost]

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[sfoslund]

Thanks John!

[dougbu]

Why $(DotnetRuntimeDependencyMajorMinorVersion) for Debian and $(MicrosoftNETCoreAppRuntimeMajorMinorVersion) for Red Hat ❔ This seems more sensible

[JunTaoLuo]

No particular reason, I guess I was just copying the convention of the nearby files. In the Rpm.TargetingPack.rpmproj it used the name MicrosoftNETCoreAppRefMajorMinorVersion. I took that and changed Ref=>Runtime and used it here. In the debproj I copied the property DotnetTargetingPackDependencyVersion from the line above and added MajorMinor. Ah well.