Prohibit instance access before super call

- Before this change members just left unresolved as they were absent in the
  specific scope named scopeForSecondaryConstructorHeaderResolution that
  created just to prohibit such accesses.
- Now they are resolved the same way as other members, but diagnostic is
  repored by in-place injected CallChecker
- Drop obsolete type of class scope

 #KT-6995 Fixed

compiler/testData/diagnostics/tests/secondaryConstructors/headerCallChecker/usingOuterInstance.kt

@@ -0,0 +1,8 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER
+fun foo(x: Outer) = 1
+class Outer {
+    inner class Inner {
+        constructor(x: Int)
+        constructor(x: Int, y: Int, z: Int = x + foo(this@Outer)) : this(x + foo(this@Outer))
+    }
+}