[Analysis API] KTIJ-24610 Ignore qualifiers with fake source in KtFirImportOptimizer

Such qualifiers can appear for extensions imported from objects

^KTIJ-24610 Fixed

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

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

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

@@ -0,0 +1,16 @@
+// FILE: main.kt
+import dependency.Bar.Companion.minutes
+import dependency.Bar.Companion
+
+fun test() {
+    10.minutes
+}
+
+// FILE: dependency.kt
+package dependency
+
+class Bar {
+    companion object {
+        val Int.minutes: Int get() = this
+    }
+}