utils/notification_service.py/handle_stacktraces
def handle_stacktraces(test_results):
    # These files should follow the following architecture:
    # === FAILURES ===
    # <path>:<line>: Error ...
    # <path>:<line>: Error ...
    # <empty line>

    total_stacktraces = test_results.split("\n")[1:-1]
    stacktraces = []
    for stacktrace in total_stacktraces:
        try:
            line = stacktrace[: stacktrace.index(" ")].split(":")[-2]
            error_message = stacktrace[stacktrace.index(" ") :]

            stacktraces.append(f"(line {line}) {error_message}")
        except Exception:
            stacktraces.append("Cannot retrieve error message.")

    return stacktraces