[SLC] AbstractSymbolLightClassesByPsiTest: add more stable order

Now more diff between sources and libraries are readable.
Also prefer .descriptors to .fir as FIR is a first-class support

^KT-62892

compiler/testData/asJava/lightClasses/lightClassByPsi/constructors.lib.java

@@ -10,6 +10,10 @@ public abstract class A /* A*/ {
   class C ...
 }
 
+public static final class C /* A.C*/ extends A {
+  public  C();//  .ctor()
+}
+
 public final class AAA /* AAA*/ {
   public  AAA(@org.jetbrains.annotations.NotNull() int[], @org.jetbrains.annotations.NotNull() kotlin.jvm.functions.Function0<kotlin.Unit>);//  .ctor(int[], kotlin.jvm.functions.Function0<kotlin.Unit>)
 }
@@ -17,10 +21,6 @@ public final class AAA /* AAA*/ {
 public final class B /* B*/ {
 }
 
-public static final class C /* A.C*/ extends A {
-  public  C();//  .ctor()
-}
-
 public final class ClassWithPrivateCtor /* ClassWithPrivateCtor*/ {
   @org.jetbrains.annotations.NotNull()
   private final java.util.Set<java.lang.Integer> property;
@@ -31,6 +31,14 @@ public final class ClassWithPrivateCtor /* ClassWithPrivateCtor*/ {
   private  ClassWithPrivateCtor(java.util.Set<java.lang.Integer>);//  .ctor(java.util.Set<java.lang.Integer>)
 }
 
+public final class Outer /* Outer*/ {
+  public  Outer();//  .ctor()
+
+  class Inner ...
+
+  class Nested ...
+}
+
 public final class Inner /* Outer.Inner*/ {
   public  Inner(int, @org.jetbrains.annotations.NotNull() java.lang.String);//  .ctor(int, java.lang.String)
 }
@@ -41,14 +49,6 @@ public static final class Nested /* Outer.Nested*/ {
   public  Nested(int, @org.jetbrains.annotations.NotNull() java.lang.String);//  .ctor(int, java.lang.String)
 }
 
-public final class Outer /* Outer*/ {
-  public  Outer();//  .ctor()
-
-  class Inner ...
-
-  class Nested ...
-}
-
 public final class TestConstructor /* TestConstructor*/ {
   private  TestConstructor(int);//  .ctor(int)
 }