Fix runtime type member writes for CLR wrappers

[nkgotcode]

Summary

Fix writes to runtime-derived CLR wrapper members.

Details

• Updates ObjectWrapper.Set to probe both declared and runtime CLR types before deciding a member write is unresolved.
• Preserves strict unresolved-member behavior when neither type can satisfy the write.
• Adds regression coverage for a base-declared property that returns a derived runtime object.

Linked issue

Fixes #2494

Test plan

• Added or updated unit tests in Jint.Tests
• Ran dotnet test --configuration Release locally
• N/A - For ECMAScript spec changes: ran Jint.Tests.Test262 and confirmed no regressions
• For interop changes: covered in Jint.Tests/Runtime/Interop
• N/A - For perf changes: included before/after numbers from Jint.Benchmark

Focused validation:

docker run --rm -v "$PWD":/work -w /work mcr.microsoft.com/dotnet/sdk:10.0 dotnet test --configuration Release Jint.Tests/Jint.Tests.csproj --filter "FullyQualifiedName~Jint.Tests.Runtime.InteropExplicitTypeTests.DerivedRuntimePropertyFromBaseDeclaredProperty|FullyQualifiedName~Jint.Tests.Runtime.InteropTests.StrictAccessStillThrowsForMissingWrites"

Passed!  - Failed:     0, Passed:     2, Skipped:     0, Total:     2, Duration: 1 s - Jint.Tests.dll (net10.0)

Breaking change?

No

[lahma]

Thank you!