[FIR] KT-56769: Ensure @receiver: is only allowed on receivers

Note that there's no code that checks that
FirReceiverParameter's annotation's use-site target
is indeed `@receiver:`, because otherwise the
annotation wouldn't have made it into
the FirReceiverParameter.

In contrast, in K1 all such annotations are treated
as annotations on a KtTypeReference.

^KT-56769 Fixed

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -519,6 +519,12 @@ public class DiagnosisCompilerTestFE10TestdataTestGenerated extends AbstractDiag
             runTest("compiler/testData/diagnostics/tests/kt56723.kt");
         }
 
+        @Test
+        @TestMetadata("kt56769.kt")
+        public void testKt56769() throws Exception {
+            runTest("compiler/testData/diagnostics/tests/kt56769.kt");
+        }
+
         @Test
         @TestMetadata("LValueAssignment.kt")
         public void testLValueAssignment() throws Exception {