[FIR] KT-54260: Fix the compiler crash

AllOpen plugin makes the properties all-open, but the annotation class
is left closed, because allopen for k2 literally checks
`classKind == CLASS`.

Since the properties are open, a
`NON_FINAL_MEMBER_IN_FINAL_CLASS` diagnostic is reported for them. It's
positioning strategy seeks for the explicit `open` modifier which is
not present.

The added test should not crash the compiler.

^KT-54260 Fixed

generators/tests/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -5,9 +5,7 @@
 
 package org.jetbrains.kotlin.generators.tests
 
-import org.jetbrains.kotlin.allopen.AbstractBytecodeListingTestForAllOpen
-import org.jetbrains.kotlin.allopen.AbstractFirBytecodeListingTestForAllOpen
-import org.jetbrains.kotlin.allopen.AbstractIrBytecodeListingTestForAllOpen
+import org.jetbrains.kotlin.allopen.*
 import org.jetbrains.kotlin.android.parcel.AbstractParcelBoxTest
 import org.jetbrains.kotlin.android.parcel.AbstractParcelBytecodeListingTest
 import org.jetbrains.kotlin.android.parcel.AbstractParcelIrBoxTest
@@ -274,6 +272,12 @@ fun main(args: Array<String>) {
             testClass<AbstractFirBytecodeListingTestForAllOpen> {
                 model("bytecodeListing", excludedPattern = excludedFirTestdataPattern)
             }
+            testClass<AbstractFirDiagnosticTestForAllOpen>() {
+                model("diagnostics", excludedPattern = excludedFirTestdataPattern)
+            }
+            testClass<AbstractFirDiagnosticsWithLightTreeTestForAllOpen>() {
+                model("diagnostics", excludedPattern = excludedFirTestdataPattern)
+            }
         }
 
         testGroup("plugins/noarg/tests-gen", "plugins/noarg/testData") {