Add SDK snapshot tests for 5.0 apps

[pranavkm]

This issue tracks adding some tests to verify the SDK does not regress building 5.0 apps

• Add a test for 5.0 MVC
• Add a test for 5.0 Blazor Server
• Add a test for 5.0 Blazor Wasm

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[captainsafia]

We've covered this for MVC apps already during the SDK migration but we still need to cover the two Blazor scenarios.

[TanayParikh]

This is entirely testing related, adding to docs & infra.