Project condition for IsTrimmable is incorrect

[hwoodiwiss]

Current Behaviour

Currently IsTrimmable is not set on a number of the Microsoft.Kiota .NET libraries as they share this incorrect condition:

<PropertyGroup Condition="'$(TargetFrameworkVersion)' == 'net5.0'">  
  <IsTrimmable>true</IsTrimmable>
</PropertyGroup>

Expected Behaviour

I would expect build errors when non-trim-safe code as added to the libraries.

Fix

The property group condition should be changed to:

<PropertyGroup Condition="'$(TargetFramework)' == 'net5.0'">  
  <IsTrimmable>true</IsTrimmable>
</PropertyGroup>

Which causes the IsTrimmable property to be correctly set, and any expected trimming related compilation failures to occur.

I've found this issue in these projects:

• - Microsoft.Kiota.Abstractions (In PR)
• - Microsoft.Kiota.Http.HttpClientLibrary (In PR)
• - Microsoft.Kiota.Serialization.Json (In PR)
• - Microsoft.Kiota.Serialization.Form (In PR)
• - Microsoft.Kiota.Authentication.Azure (In PR)
• - Microsoft.Kiota.Serialization.Multipart (In PR)
• - Microsoft.Kiota.Serialization.Text (In PR)

[baywet]

For additional context: while the property being used exists in some contexts it seems it wasn't the right one https://learn.microsoft.com/en-us/dotnet/core/project-sdk/msbuild-props#targetframework

Additional evidence
https://www.aloneguid.uk/posts/2022/08/csproj-condition-cheat-sheet/