revert .net sdk version to 9.0.101

[haruna99]

Related Issue

dotnet/dnceng#4635

To double check:

• The right tests are in and the right validation has happened. Guidance: https://github.com/dotnet/arcade/blob/main/Documentation/Validation.md

PR Summary

This pull request reverts .net sdk to version 9 to resolve build issues

[ViktorHofer]

We don't want to downgrade back to a 9.0.xxx SDK. We explicitly need the .NET 10 SDK for the .NET 10 Preview 1 release. cc @mmitche

[ViktorHofer]

This is a pipeline specific issue and therefore shouldn't force Arcade to go back to a previous SDK. The dotnet-arcade-daily pipeline must be able to use prerelease SDKs or should manually pin back to an older SDK.

[mmitche]

@haruna99 Viktor is right here. I think the correct thing to do may just be to do a restore (Restore.cmd) of the arcade repo instead of the 'Install global.json SDK' step. That will also install the SDK from the global.json.

[mmitche]

@haruna99 Any success here?

[haruna99]

@mmitche I am still working on it. I attempted to restore but encountered errors during the secret-manager synchronization stage. This stage attempts to access .NET 10 online and is unable to access the version downloaded by the restore stage.