Add trim analysis warnings for delegate creation #92427
                
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The ILLink analyzer was not producing warnings for annotated methods, lambdas, or local functions accessed for delegate creation.
Some ExpectedWarnings for ILLink/NativeAot were updated to avoid relying on the name of the compiler-generated methods for lambdas or local functions, because the analyzer reports the warnings as:
IL2111: Method 'lambda expression' with parameters... is accessed via reflection.
Fixes #84918