Improve result message of Slack alerts for dimension anomalies

[giamo]

Is your feature request related to a problem? Please describe. When creating a dimension anomaly, the observability report correctly shows all dimension values with outliers. However, if a Slack alert is configured it sends a message which only contains information about just one of the dimension values without mention of the other ones.

Describe the solution you'd like Ideally the whole information about the anomaly (i.e. all the dimension values with outliers) should appear in the alert message, but I understand that there are message length limitations to be considered. At the very least I would expect to know the number of failing dimensions and possibly to have a broader preview of the result.

Describe alternatives you've considered N/A

Additional context Example of anomaly result:

and corresponding message on Slack:

Would you be willing to contribute this feature? Sure!