Fixed consuming CSharp interface with an inref parameter (#8287)

* Added inref interop test

* Fixed inref interop when creating a slot sig

* 3.1 to 3.0

Author: TIHan

src/fsharp/infos.fs

@@ -1536,7 +1536,7 @@ type MethInfo =
                     let formalRetTy = ImportReturnTypeFromMetadata amap m ilminfo.RawMetadata.Return.Type ilminfo.RawMetadata.Return.CustomAttrs ftinfo.ILScopeRef ftinfo.TypeInstOfRawMetadata formalMethTyparTys
                     let formalParams =
                         [ [ for p in ilminfo.RawMetadata.Parameters do
-                                let paramType = ImportILTypeFromMetadata amap m ftinfo.ILScopeRef ftinfo.TypeInstOfRawMetadata formalMethTyparTys p.Type
+                                let paramType = ImportILTypeFromMetadataWithAttributes amap m ftinfo.ILScopeRef ftinfo.TypeInstOfRawMetadata formalMethTyparTys p.Type p.CustomAttrs
                                 yield TSlotParam(p.Name, paramType, p.IsIn, p.IsOut, p.IsOptional, []) ] ]
                     formalRetTy, formalParams
 #if !NO_EXTENSIONTYPING