KT-65425 [SLC] Correctly compute getQualifiedName for generated classes

Since the declarations generated by compiler plugins do not have proper
PSI (`classOrObjectDeclaration` in this case), we need to resort to
symbols for such declarations to compute the proper qualified name

^KT-65425 Fixed

compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.descriptors.java

@@ -0,0 +1,7 @@
+public final class TestClass /* test.TestClass*/ {
+  private final error.NonExistentClass usage;
+
+  public  TestClass();//  .ctor()
+
+  public final error.NonExistentClass getUsage();//  getUsage()
+}

compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.java

@@ -0,0 +1,7 @@
+public final class TestClass /* test.TestClass*/ {
+  private final MyClass.Companion usage;
+
+  public  TestClass();//  .ctor()
+
+  public final MyClass.Companion getUsage();//  getUsage()
+}

compiler/testData/asJava/lightClasses/lightClassByFqName/withTestCompilerPluginEnabled/companionWithFoo_companionTypeUsedInJava_ReferenceFromKotlin.kt

@@ -0,0 +1,26 @@
+// test.TestClass
+
+// Java code does not see declarations generated by compiler plugins, see KT-65454
+// COMPILATION_ERRORS
+
+// WITH_FIR_TEST_COMPILER_PLUGIN
+
+// FILE: main.kt
+package test
+
+import org.jetbrains.kotlin.fir.plugin.CompanionWithFoo
+
+@CompanionWithFoo
+class MyClass
+
+class TestClass {
+    val usage = CompanionProvider.provide()
+}
+
+// FILE: test/JavaClass.java
+package test;
+
+public class CompanionProvider {
+    // generated MyClass.Companion type reference in java
+    public static MyClass.Companion provide() { return null; }
+}