Fix retrieval of SDK version on .NET 6.0.0

[Arshia001]

Fixes #2618. I'm not sure if a test can be implemented, since we can't enforce values for RuntimeInformation.FrameworkDescription.

[yazeedobaid]

Thanks for contributing!

Stripping the build information will lead to using 6.0.0 currently in the reported issues. For the next versions of DotNet, we cannot guarantee that stripping the build information is the correct way to resolve the runtime version matching the specified SDK.

Using RuntimeInformation.FrameworkDescription to determine the runtime version seems to be not guaranteed and how it determines the runtime version is not obvious. I tried it with the following installed SDKs and runtimes:

SDK version -> runtime version
6.0.100-preview.3.21202.5 -> 6.0.0-preview.3.21201.4
6.0.100 -> 6.0.0

Specifying the two SDKs in a global.json file, in both cases, it resolved to 6.0.0-preview.3.21201.4 runtime. Stripping the build information will lead to 6.0.0 which is the latest. But we cannot guarantee this for the next releases.

Currently, I'm working on a PR to use the DotNet releases package Baron has suggested which resolved the correct SDK version and we can predict what we will get instead of guessing using RuntimeInformation.FrameworkDescription.

[Arshia001]

Yes, I just saw your changes. That's obviously the more stable way to resolve this issue. Keep up the good work!

[yazeedobaid]

@Arshia001 thanks