Refactor parameter names in _MockHttpHelper methods for consistency

- Renamed parameters in the `get` and `post` methods from `url` and `params` to `_url` and `_params`, and from `json` to `_json` respectively, to improve clarity and maintain consistency in naming conventions.

Author: Sergii Solonyna

tests/integration/conftest.py

@@ -40,8 +40,8 @@ class _MockHttpHelper:
 
     def get(
         self,
-        url: str,
-        params: dict[str, Any] | None = None,
+        _url: str,
+        _params: dict[str, Any] | None = None,
         response_type: Literal["json", "text"] = "json",
     ) -> Any:
         if response_type == "text":
@@ -50,8 +50,8 @@ def get(
 
     def post(
         self,
-        url: str,
-        json: dict[str, Any] | None = None,
+        _url: str,
+        _json: dict[str, Any] | None = None,
         response_type: Literal["json", "text"] = "json",
     ) -> Any:
         if response_type == "text":