Refactor CI documentation and improve change processing logic

- Updated CI documentation to enforce running the full suite without skipping the rbx-dom section, clarifying the execution steps.
- Refactored `change_processor.rs` for improved readability by enhancing formatting and structure in name deduplication logic.
- Cleaned up imports in `project.rs` and improved formatting in `file_names.rs` to enhance code clarity and maintainability.
- Adjusted test assertions in `two_way_sync.rs` for better readability and consistency in checking file existence after renaming operations.

tests/tests/two_way_sync.rs

@@ -5226,7 +5226,10 @@ fn rename_slugified_to_clean() {
 
         poll_file_exists(&new_path, "CleanName.luau after rename");
         poll_not_exists(&old_path, "What_Module.luau should be gone after rename");
-        poll_not_exists(&old_meta, "What_Module.meta.json5 should be gone after rename");
+        poll_not_exists(
+            &old_meta,
+            "What_Module.meta.json5 should be gone after rename",
+        );
 
         // The new meta file should either not exist (clean name needs no
         // name override) or, if it exists, should NOT contain a "name" field.