KTIJ-26576 [Analysis API] Add where clause to classHeaderParts in FirTowerDataContextAllElementsCollector

In `where` clause there are type constraints, and there are no
supertypes scopes at those positions

^KTIJ-26576 Fixed

analysis/analysis-api/testData/components/referenceShortener/referenceShortener/nestedClasses/classHeaderPositions/typeBound_whereClause.kt

@@ -0,0 +1,7 @@
+// FILE: main.kt
+
+abstract class Outer {
+    abstract class Nested : Outer()
+}
+
+class Foo<T> : Outer.Nested() where T : <expr>Outer.Nested</expr>

analysis/analysis-api/testData/components/referenceShortener/referenceShortener/nestedClasses/classHeaderPositions/typeBound_whereClause.txt

@@ -0,0 +1,7 @@
+Before shortening: Outer.Nested
+with DO_NOT_SHORTEN:
+with SHORTEN_IF_ALREADY_IMPORTED:
+with SHORTEN_AND_IMPORT:
+[type] Outer.Nested
+with SHORTEN_AND_STAR_IMPORT:
+[type] Outer.Nested