Revert "Hack for Random mocks (#2702)"

This reverts commit 4fa518e.

Author: EgorkaKulikov

utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/jc/JcTestExecutor.kt

@@ -149,12 +149,10 @@ class JcTestExecutor(
         override fun allocateString(value: UTestExpression): UTestExpression = value
 
         override fun resolveObject(ref: UConcreteHeapRef, heapRef: UHeapRef, type: JcClassType): UTestExpression {
-            if (ref !in resolvedMethodMocks || type.jcClass.name != "java.util.Random") {
+            if (ref !in resolvedMethodMocks) {
                 return super.resolveObject(ref, heapRef, type)
             }
 
-            // Hack: mock only Random
-
             val mocks = resolvedMethodMocks.getValue(ref)
 
             val fieldValues = mutableMapOf<JcField, UTestExpression>()