fix(client): Do no longer send TesterPresent in ResponsePending loop

We now had multiple occasions where the TesterPresent request with
suppress response bit set triggered a reply by the ECU.
This reply will be treated as the awaited answer of the ResponsePending
loop which cannot be recovered from.

Not sending TesterPresent in the loop also conforms to the UDS standard.

src/gallia/services/uds/core/client.py

@@ -137,10 +137,6 @@ async def request_unsafe(
                         raise BrokenPipeError("connection to target lost")
                     logger.debug(raw_resp.hex(), extra={"tags": ["read", "uds"] + tags})
                 except TimeoutError as e:
-                    # Send a tester present to indicate that
-                    # we are still there.
-                    # TODO: Is this really necessary?
-                    await self._tester_present(suppress_resp=True)
                     n_timeout += 1
                     if n_timeout >= max_n_timeout:
                         last_exception = MissingResponse(request, str(e))