FIR: implement diagnostics for qualifier as stand-alone expression case

compiler/fir/analysis-tests/testData/resolve/expresssions/classifierAccessFromCompanion.kt

@@ -4,7 +4,7 @@ class Factory {
     }
 
     companion object {
-        val f = Function
+        val f = <!NO_COMPANION_OBJECT!>Function<!>
         val x = Function.Default
     }
 }

compiler/fir/analysis-tests/testData/resolve/expresssions/innerQualifier.kt

@@ -2,5 +2,5 @@ class Outer {
     inner class Inner
 }
 
-val x = Outer.Inner
+val x = Outer.<!NO_COMPANION_OBJECT!>Inner<!>
 val klass = Outer.Inner::class

compiler/fir/analysis-tests/testData/resolve/expresssions/qualifierPriority.kt

@@ -23,7 +23,8 @@ object D {
 val D.E get() = ""
 
 val def = D.E.F // object
-val de = D.E // extension
+// See KT-46409
+val de = D.<!NO_COMPANION_OBJECT!>E<!> // Should be: extension & no error, in fact: qualifier
 
 enum class G {
     H;