Moving to .NET 8

[Darren Hoehna (dhoehna)]

Summary of the pull request

Upgrading everything to .NET 8 and handling all the syntax errors that comes with it.

References and relevant issues

#80 is in progress, but this needs to go in because DevHome is in .NET 8.

Detailed description of the pull request / Additional comments

Validation steps performed

PR checklist

• Closes #xxx
• Tests added/passed
• Documentation updated

[agniuks]

As Manodasan Wignarajah (@manodasanW) figured out, the use of version-specific RIDs and the associated workaround will no longer be needed once there's a new version of the Dev Home SDK and the extensions upgrade to it. Namely it needs this change here: Blaming devhome/extensionsdk/nuget/Microsoft.Windows.DevHome.SDK.nuspec at c08f7ed23e6e0070a6d5ab24e40c257309f27a75 · microsoft/devhome (github.com) . Could be good to open up an issue as a reminder to clean this up once it's no longer needed.

[Sophia Chen (chenss3)]

As Manodasan Wignarajah (@manodasanW) figured out, the use of version-specific RIDs and the associated workaround will no longer be needed once there's a new version of the Dev Home SDK and the extensions upgrade to it. Namely it needs this change here: Blaming devhome/extensionsdk/nuget/Microsoft.Windows.DevHome.SDK.nuspec at c08f7ed23e6e0070a6d5ab24e40c257309f27a75 · microsoft/devhome (github.com) . Could be good to open up an issue as a reminder to clean this up once it's no longer needed.

I opened up an issue (#81) for the previous PR (#80) that we could potentially reuse.