KT-60957 [Analysis API] Properly handle source PSI for implicit invoke calls in KtFirReferenceShortener

For implicit invoke operator calls, there are two instances of
`FirResolvedNamedReference`. One of them references `invoke` function
and cannot be used to analyze the property access, and the second one
has `source == null`. Luckily, the parent of the second reference is
`FirPropertyAccessExpression`, which has the correct source

^KT-60957 Fixed

analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceShortenerTestGenerated.java

@@ -460,6 +460,12 @@ public class FirStandaloneNormalAnalysisSourceModuleReferenceShortenerTestGenera
         runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variableAssignment_plusOperator.kt");
     }
 
+    @Test
+    @TestMetadata("variable_invokeOperator.kt")
+    public void testVariable_invokeOperator() throws Exception {
+        runTest("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/variable_invokeOperator.kt");
+    }
+
     @Nested
     @TestMetadata("analysis/analysis-api/testData/components/referenceShortener/referenceShortener/nestedClasses")
     @TestDataPath("$PROJECT_ROOT")