Remove a few unused error codes (#54663)

src/Compilers/CSharp/Portable/CSharpResources.resx

@@ -4178,9 +4178,6 @@ You should consider suppressing the warning only if you're sure that you don't w
   <data name="ERR_DeprecatedCollectionInitAddStr" xml:space="preserve">
     <value>The best overloaded Add method '{0}' for the collection initializer element is obsolete. {1}</value>
   </data>
-  <data name="ERR_IteratorInInteractive" xml:space="preserve">
-    <value>Yield statements may not appear at the top level in interactive code.</value>
-  </data>
   <data name="ERR_SecurityAttributeInvalidTarget" xml:space="preserve">
     <value>Security attribute '{0}' is not valid on this declaration type. Security attributes are only valid on assembly, type and method declarations.</value>
   </data>
@@ -5323,9 +5320,6 @@ To remove the warning, you can use /reference instead (set the Embed Interop Typ
   <data name="ERR_BadAsyncMethodBuilderTaskProperty" xml:space="preserve">
     <value>For type '{0}' to be used as an AsyncMethodBuilder for type '{1}', its Task property should return type '{1}' instead of type '{2}'.</value>
   </data>
-  <data name="ERR_AttributesInLocalFuncDecl" xml:space="preserve">
-    <value>Attributes are not allowed on local function parameters or type parameters</value>
-  </data>
   <data name="ERR_TypeForwardedToMultipleAssemblies" xml:space="preserve">
     <value>Module '{0}' in assembly '{1}' is forwarding the type '{2}' to multiple assemblies: '{3}' and '{4}'.</value>
   </data>

src/Compilers/CSharp/Portable/Errors/ErrorCode.cs

@@ -1207,7 +1207,7 @@ internal enum ErrorCode
         //WRN_PDBConstantStringValueTooLong = 7063,     gave up on this warning
         ERR_CantOpenIcon = 7064,
         ERR_ErrorBuildingWin32Resources = 7065,
-        ERR_IteratorInInteractive = 7066,
+        // ERR_IteratorInInteractive = 7066,
         ERR_BadAttributeParamDefaultArgument = 7067,
         ERR_MissingTypeInSource = 7068,
         ERR_MissingTypeInAssembly = 7069,
@@ -1468,7 +1468,7 @@ internal enum ErrorCode
         ERR_PublicSignNetModule = 8202,
         ERR_BadAssemblyName = 8203,
         ERR_BadAsyncMethodBuilderTaskProperty = 8204,
-        ERR_AttributesInLocalFuncDecl = 8205,
+        // ERR_AttributesInLocalFuncDecl = 8205,
         ERR_TypeForwardedToMultipleAssemblies = 8206,
         ERR_ExpressionTreeContainsDiscard = 8207,
         ERR_PatternDynamicType = 8208,