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/testData/refactoring/move/kotlin/moveFile/moveFileWithDotsAsFileReferences/after/b/main.kt

@@ -0,0 +1,2 @@
+val a = "."
+val b = ".."

idea/testData/refactoring/move/kotlin/moveFile/moveFileWithDotsAsFileReferences/before/a/a/main.kt

@@ -0,0 +1,2 @@
+val a = "."
+val b = ".."

idea/testData/refactoring/move/kotlin/moveFile/moveFileWithDotsAsFileReferences/moveFileWithDotsAsFileReferences.test

@@ -0,0 +1,5 @@
+{
+  "mainFile": "a/a/main.kt",
+  "type": "MOVE_FILES",
+  "targetDirectory": "b"
+}