refactor: Reuse private method to append search path to reduce code duplication

Author: pawamoy

src/griffe/_internal/finder.py

@@ -125,7 +125,9 @@ def append_search_path(self, path: Path) -> None:
         Parameters:
             path: The path to append.
         """
-        path = path.resolve()
+        self._append_search_path(path.resolve())
+
+    def _append_search_path(self, path: Path) -> None:
         if path not in self.search_paths:
             self.search_paths.append(path)
 
@@ -379,10 +381,6 @@ def _contents(self, path: Path) -> list[Path]:
                 self._paths_contents[path] = []
         return self._paths_contents[path]
 
-    def _append_search_path(self, path: Path) -> None:
-        if path not in self.search_paths:
-            self.search_paths.append(path)
-
     def _extend_from_pth_files(self) -> None:
         for path in self.search_paths:
             for item in self._contents(path):