Update versions for Dev Tunnels SSH package for C# and TS

[DavidObando]

Changes proposed:

• Updates the C# and TypeScript dependencies for Dev Tunnels SSH to incorporate robustness changes.
• Updates C# tests to net8 and removes need for net6 runtime in CI

Other Tasks:

• If you updated the TS SDK did you update the dependencies in package.json for connections and management to require a dependency that is > the current published version(Found using npm view @microsoft/dev-tunnels-contracts). This will fix issues where yarn will pull the old version of packages and will cause mismatched dependencies. See example PR

[DavidObando]

/azp run

[azure-pipelines]

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