Checkmk Werk 15507: host_tag_group: bring name patterns together

ID: 15507 Title: host_tag_group: bring name patterns together Component: REST API Level: 1 Class: Bug fix Version: 2.3.0b1 Prior to this werk, the endpoints all had subtle differences in which string patterns were allowed as ident. This also differed to the pattern in the UI. This werk fixes this and makes the pattern consistent across all mentioned.