Refactor user-messages and internal logs with logging-handler

[kopytjuk]

Currently internal logging and state messages to the frontend are separate code paths.

@app.task(bind=True)
def run_imdb_user_watchlist_check(self, url: str, location_code: str) -> dict:

    pt = ProgressTracker(self)

    pt.info("Starting ...")

    url = url.strip()

    response_dict = {"result": None}

    response_dict["result"] = check_imdb_user_watchlist(url, location_code, pt)

    pt.info("Finalizing ...")

    return response_dict

Merge both in one solution and remove ProgressTracker.