Alerting: introduce AlertQuery in definitions package (#63825)

* copy AlertQuery from ngmodels to the definition package
* replaces usages of ngmodels.AlertQuery in API models
* create a converter between models of AlertQuery
---------

Co-authored-by: Alex Moreno <alexander.moreno@grafana.com>

pkg/services/ngalert/api/tooling/definitions/testing.go

@@ -10,8 +10,6 @@ import (
 	"github.com/prometheus/alertmanager/config"
 	"github.com/prometheus/common/model"
 	"github.com/prometheus/prometheus/promql"
-
-	"github.com/grafana/grafana/pkg/services/ngalert/models"
 )
 
 // swagger:route Post /api/v1/rule/test/grafana testing RouteTestRuleGrafanaConfig
@@ -95,8 +93,8 @@ type EvalQueriesRequest struct {
 
 // swagger:model
 type EvalQueriesPayload struct {
-	Data []models.AlertQuery `json:"data"`
-	Now  time.Time           `json:"now"`
+	Data []AlertQuery `json:"data"`
+	Now  time.Time    `json:"now"`
 }
 
 func (p *TestRulePayload) UnmarshalJSON(b []byte) error {
@@ -187,9 +185,9 @@ type BacktestConfig struct {
 	To       time.Time      `json:"to"`
 	Interval model.Duration `json:"interval,omitempty"`
 
-	Condition string              `json:"condition"`
-	Data      []models.AlertQuery `json:"data"` // TODO yuri. Create API model for AlertQuery
-	For       model.Duration      `json:"for,omitempty"`
+	Condition string         `json:"condition"`
+	Data      []AlertQuery   `json:"data"`
+	For       model.Duration `json:"for,omitempty"`
 
 	Title       string            `json:"title"`
 	Labels      map[string]string `json:"labels,omitempty"`