[FIR IDE] Add unwrapping substitution overrides which doesn't affect function's signature

Also, do not use PSI to restore SUBSTITUTION_OVERRIDE function/property
symbols

analysis/analysis-api/testData/scopes/substitutionOverridesUnwrapping/ClassWithGenericBase2.kt

@@ -0,0 +1,15 @@
+package test
+
+class Foo
+
+abstract class Base<T> {
+    val noGeneric: Foo? = null
+
+    val withOuterGeneric: T? = null
+
+    val <TT> TT.withOwnGeneric: TT? get() = null
+
+    val <TT> TT.withOuterAndOwnGeneric: T? get() = null
+}
+
+class <caret>ClassWithGenericBase : Base<Foo>()