[2.3.0] Checkmk Werk 16619 adapted: Ruleset API: Ruleset validation

Werk 16619 was adapted. The following is the new Werk, a diff is shown at the end of the message. [//]: # (werk v2) # Ruleset API: Ruleset validation key | value ---------- | --- date | 2024-03-11T12:46:16+00:00 version | 2.3.0b3 class | fix edition | cre component | checks level | 1 compatible | no Rulespec/ruleset names now have to be valid [python identifiers](https://docs.python.org/3/reference/lexical_analysis.html#iden…. The validation occurs during instantiation and will raise a `ValueError` when a violation is found. ------------------------------------<diff>------------------------------------------- [//]: # (werk v2) # Ruleset API: Ruleset validation key | value ---------- | --- date | 2024-03-11T12:46:16+00:00 version | 2.3.0b3 class | fix edition | cre component | checks level | 1 compatible | no Rulespec/ruleset names now have to be valid [python identifiers](https://docs.python.org/3/reference/lexical_analysis.html#iden…. The validation occurs during instantiation and will raise a `ValueError` when a violation is found. -