Safe Delete: Skip internal usages of class constructors when deleting class itself

#KT-8857 Fixed

idea/testData/safeDelete/deleteClass/kotlinClass/classWithExternalConstructructorUsage.kt

@@ -0,0 +1,5 @@
+open class <caret>Foo() {
+    constructor(p: Int) : this()
+}
+
+class Bar : Foo(1)

idea/testData/safeDelete/deleteClass/kotlinClass/classWithExternalConstructructorUsage.kt.messages

@@ -0,0 +1 @@
+class Foo has 1 usage that is not safe to delete.

idea/testData/safeDelete/deleteClass/kotlinClass/classWithInternalConstructructorUsage.kt

@@ -0,0 +1,5 @@
+class <caret>Foo() {
+    constructor(p: Int) : this()
+}
+
+class Bar

idea/testData/safeDelete/deleteClass/kotlinClass/classWithInternalConstructructorUsage.kt.after

@@ -0,0 +1 @@
+class Bar

idea/testData/safeDelete/deleteClass/kotlinClassWithJava/classWithDelegationCalls.kt.messages

@@ -1 +1 @@
-class B has 4 usages that are not safe to delete.
+class B has 3 usages that are not safe to delete.