fix: correct _api_level_md call in file resource methods (#3266)

## Summary
- Fixed incorrect `_api_level_md(**kwargs)` calls in
`add_file_resource`, `remove_file_resource`, and `list_file_resources`
methods
- Changed to `_api_level_md(kwargs.get("context"))` to align with all
other methods in `grpc_handler.py`
- `_api_level_md` only accepts a single `context` parameter, passing
`**kwargs` could cause `TypeError` if kwargs contains unexpected keys

## Test plan
- [x] Verify `add_file_resource`, `remove_file_resource`,
`list_file_resources` work correctly
- [x] Confirm consistency with other grpc_handler methods

---------

Signed-off-by: zhuwenxing <wenxing.zhu@zilliz.com>

Author: zhuwenxing

pymilvus/client/grpc_handler.py

@@ -3357,7 +3357,9 @@ def add_file_resource(
         **kwargs,
     ):
         req = Prepare.add_file_resource(name=name, path=path)
-        resp = self._stub.AddFileResource(req, timeout=timeout, metadata=_api_level_md(**kwargs))
+        resp = self._stub.AddFileResource(
+            req, timeout=timeout, metadata=_api_level_md(kwargs.get("context"))
+        )
         check_status(resp)
 
     @retry_on_rpc_failure()
@@ -3368,7 +3370,9 @@ def remove_file_resource(
         **kwargs,
     ):
         req = Prepare.remove_file_resource(name=name)
-        resp = self._stub.RemoveFileResource(req, timeout=timeout, metadata=_api_level_md(**kwargs))
+        resp = self._stub.RemoveFileResource(
+            req, timeout=timeout, metadata=_api_level_md(kwargs.get("context"))
+        )
         check_status(resp)
 
     @retry_on_rpc_failure()
@@ -3378,6 +3382,8 @@ def list_file_resources(
         **kwargs,
     ) -> List[str]:
         req = Prepare.list_file_resources()
-        resp = self._stub.ListFileResources(req, timeout=timeout, metadata=_api_level_md(**kwargs))
+        resp = self._stub.ListFileResources(
+            req, timeout=timeout, metadata=_api_level_md(kwargs.get("context"))
+        )
         check_status(resp.status)
         return [FileResourceInfo(info) for info in resp.resources]

tests/grpc_handler/test_utility.py

@@ -546,3 +546,42 @@ def test_describe_index_not_found(self, handler):
         # With empty index_descriptions, it raises AmbiguousIndexName
         with pytest.raises(AmbiguousIndexName):
             handler.describe_index("coll", "nonexistent")
+
+
+class TestGrpcHandlerFileResource:
+    """Tests for file resource operations."""
+
+    def test_add_file_resource(self, handler):
+        mock_resp = MagicMock()
+        mock_resp.code = 0
+        mock_resp.error_code = 0
+        mock_resp.reason = ""
+        handler._stub.AddFileResource.return_value = mock_resp
+
+        handler.add_file_resource("test_resource", "/path/to/file")
+        handler._stub.AddFileResource.assert_called_once()
+
+    def test_remove_file_resource(self, handler):
+        mock_resp = MagicMock()
+        mock_resp.code = 0
+        mock_resp.error_code = 0
+        mock_resp.reason = ""
+        handler._stub.RemoveFileResource.return_value = mock_resp
+
+        handler.remove_file_resource("test_resource")
+        handler._stub.RemoveFileResource.assert_called_once()
+
+    def test_list_file_resources(self, handler):
+        mock_info = MagicMock()
+        mock_info.name = "res1"
+        mock_info.path = "/path/to/res1"
+        mock_resp = MagicMock()
+        mock_resp.status.code = 0
+        mock_resp.status.error_code = 0
+        mock_resp.status.reason = ""
+        mock_resp.resources = [mock_info]
+        handler._stub.ListFileResources.return_value = mock_resp
+
+        result = handler.list_file_resources()
+        assert len(result) == 1
+        handler._stub.ListFileResources.assert_called_once()