KTIJ-26501 [Analysis API] Do not ignore vararg type references in KtFirImportOptimizer

Turns out they have fake sources, so ignoring all
type qualifiers with fake sources in e1ebbc10d9
was incorrect.

^KTIJ-26501 Fixed

analysis/analysis-api/testData/components/importOptimizer/analyseImports/unusedTypeAsVarargType.imports

@@ -0,0 +1 @@
+dependency.Bar

analysis/analysis-api/testData/components/importOptimizer/analyseImports/unusedTypeAsVarargType.kt

@@ -0,0 +1,11 @@
+// FILE: main.kt
+package test
+
+import dependency.Bar
+
+fun usage(vararg p: dependency.Bar) {}
+
+// FILE: dependency.kt
+package dependency
+
+class Bar

analysis/analysis-api/testData/components/importOptimizer/analyseImports/usedTypeAsVarargType.kt

@@ -0,0 +1,11 @@
+// FILE: main.kt
+package test
+
+import dependency.Bar
+
+fun usage(vararg p: Bar) {}
+
+// FILE: dependency.kt
+package dependency
+
+class Bar