rename pending tasks api endpoint to be more in line with others

def setup_progress_api(app):

    app.add_api_route("/internal/pendingTasks", get_pending_tasks, methods=["GET"])

    app.add_api_route("/internal/pending-tasks", get_pending_tasks, methods=["GET"])

    return app.add_api_route("/internal/progress", progressapi, methods=["POST"], response_model=ProgressResponse)

def get_pending_tasks():

    pending_tasks_ids = list(pending_tasks)

    pending_len = len(pending_tasks_ids)