Create error message when UnmanagedCallersOnly is used with DllImport.

[AaronRobinsonMSFT]

Fixes #92409

[Copilot]

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

Files not reviewed (1)

• src/coreclr/dlls/mscorrc/mscorrc.rc: Language not supported

Comments suppressed due to low confidence (2)

src/coreclr/vm/dllimport.cpp:4293

• Ensure that the additional parameters from GetMethodInfoNoSig (namespaceOrClassName and methodName) are always correctly populated to maintain consistency in the error message formatting.

        {

src/coreclr/dlls/mscorrc/resource.h:38

• Verify that the new resource identifier does not conflict with existing IDs and that its value aligns with the overall resource numbering scheme.

#define IDS_EE_NDIRECT_NAMED_UNSUPPORTED_SIG    0x1709

[AaronRobinsonMSFT]

Mono doesn't have a consistent error message for this case so I left it "as is".

[AaronRobinsonMSFT]

/ba-g Timeouts and QUIC