[FIR IDE] Add Fir lightclasses tests and fix FindUsages tests

idea/testData/findUsages/java/findJavaFieldUsages/JKFieldUsages.0.java

@@ -1,6 +1,7 @@
 // PSI_ELEMENT: com.intellij.psi.PsiField
 // OPTIONS: skipWrite
-// FIR_COMPARISON
 public class A {
     public String <caret>foo = "foo";
-}
+}
+
+// FIR_COMPARISON

idea/testData/findUsages/java/findJavaMethodUsages/JKMethodUsages.0.java

@@ -1,6 +1,5 @@
 // PSI_ELEMENT: com.intellij.psi.PsiMethod
 // OPTIONS: usages
-// FIR_COMPARISON
 class A {
     public void <caret>foo() {
 
@@ -12,4 +11,6 @@ class B extends A {
     public void foo() {
 
     }
-}
+}
+
+// FIR_COMPARISON

idea/testData/findUsages/java/findJavaMethodUsages/MismatchedAccessor.0.java

@@ -1,6 +1,5 @@
 // PSI_ELEMENT: com.intellij.psi.PsiMethod
 // OPTIONS: usages
-// FIR_COMPARISON
 public class Bar {
     public String getValue() {
         return "value";
@@ -9,4 +8,6 @@ public class Bar {
     public String <caret>getValue(String param) {
         return "value " + param;
     }
-}
+}
+
+// FIR_COMPARISON

idea/testData/findUsages/java/findJavaPropertyUsages/javaPropertyGetterUsagesKJ.0.java

@@ -26,4 +26,6 @@ class Test {
         new B().getP();
         new B().setP(1);
     }
-}
+}
+
+// FIR_IGNORE

idea/testData/findUsages/java/findJavaPropertyUsages/javaPropertySetterUsagesKJ.0.java

@@ -26,4 +26,6 @@ class Test {
         new B().getP();
         new B().setP(1);
     }
-}
+}
+
+// FIR_IGNORE