Backport of#109234 to release/9.0-staging

/cc@jkoritzinsky

Customer Impact

• Customer reported
• Found internally

Consumers trying to use the newWasmImportLinkage attribute introduced in .NET 9 encounter unexpected and inconsistent failures when usingLibraryImportAttribute, the recommended mechanism for doing interop with C-ABI libraries.

This backport introduces the support forWasmImportLinkage toLibraryImportAttribute, so the new attribute can be used as our documentation and the attribute's design intend, as well as how our users expect.

Regression

• Yes
• No

[If yes, specify when the regression was introduced. Provide the PR or commit if known.]

Testing

[How was the fix verified? How was the issue missed previously? What tests were added?]

We added tests to verify that the attribute is forwarded to the underlyingDllImport and as such will provide the expected experience.

Risk

[High/Medium/Low. Justify the indication by mentioning how risks were measured and addressed.]

Low:LibraryImport is never used in combination withWasmImportLinkage in any product code, so we won't be making any changes to any generated product code with this backport.

Additionally, the scope of this change is similar to the scope of similar changes we've backported previously and to changes that are introduced in new SDK bands in code fixes and analyzers shipped in the SDK.