[release/7.0] [hot_reload] implement param reflection #77734
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otherwise the CancellationToken type is trimmed on wasm
remove duplicated code
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Backport of #77563 to release/7.0
/cc @lambdageek
Customer Impact
In .NET 7 we enabled mobile and WebAssembly users to use Hot Reload to add new functions to existing classes. In MAUI, this allows users to use XAML Hot Reload and C# Hot Reload together to create new elements and attach new event handlers to them in a running hot reload session. This PR fixes a crash when MAUI called the new added callbacks using reflection.
This PR enables a key scenario.
Testing
New CI tests. Manual verification that the PR addresses the MAUI crashes.
Risk
Low. All the new code is gated on a hot reload change being applied to the runtime. In other words, production apps will not run any of the modified code paths.