KT-33372 Remove renaming file reference to the contents of the file

- There is still a hack with returning null from `getLastFileReference`,
it is here to keep KT-25674 issue fixed
- Overrides of `bindToElement` are removed, they caused renames of the
file references to their contents
- Code of `KotlinFilePathReferenceContributor.kt` is refactored
- ^KT-33372 ^KT-32514 ^KT-36306 Fixed

idea/performanceTests/test/org/jetbrains/kotlin/idea/perf/PerformanceBasicCompletionHandlerTestGenerated.java

@@ -143,6 +143,11 @@ public class PerformanceBasicCompletionHandlerTestGenerated extends AbstractPerf
         runTest("idea/idea-completion/testData/handlers/basic/KT23627.kt");
     }
 
+    @TestMetadata("KT36306.kt")
+    public void testKT36306() throws Exception {
+        runTest("idea/idea-completion/testData/handlers/basic/KT36306.kt");
+    }
+
     @TestMetadata("NestedTypeArg.kt")
     public void testNestedTypeArg() throws Exception {
         runTest("idea/idea-completion/testData/handlers/basic/NestedTypeArg.kt");