- always use `$([MSBuild]::VersionXYZ(...))` for version checks
- use `$(NETCoreAppFrameworkIdentifier)` where it's available
- move `$(KnownAppHostPackOrFrameworkReferenceTfm)` setting to Directory.Build.props
- use it to correct `@(KnownFrameworkReference)` updates
- metadata of those items still uses `netcoreapp5.0`
- see also https://github.com/dotnet/efcore/pull/22279#discussion_r478674176
nits:
- do not assume `$(TargetFrameworkVersion)` starts with a 'v'; valid w/o it
- add `$(_IsMicrosoftNETCoreApp20OrOlder)` property in OpenAPI targets file
- evaluate the `Condition` once instead of three times
1f84e28882