Team LBAC: Able to configure default rule (#77946)

Co-authored-by: Eric Leijonmarck <eric.leijonmarck@gmail.com>

pkg/services/datasources/models.go

@@ -78,6 +78,8 @@ type TeamHTTPHeader struct {
 	Value  string `json:"value"`
 }
 
+const DefaultTeamHTTPHeader = "default"
+
 func (ds DataSource) TeamHTTPHeaders() (TeamHTTPHeaders, error) {
 	return GetTeamHTTPHeaders(ds.JsonData)
 }