Alerting: Fix rule state history with annotations backend (#101174)

* add alertUID to annotations API query parameter
* update state history UI to fetch rule by UID

---------

Signed-off-by: Yuri Tseretyan <yuriy.tseretyan@grafana.com>

pkg/api/annotations.go

@@ -41,6 +41,7 @@ func (hs *HTTPServer) GetAnnotations(c *contextmodel.ReqContext) response.Respon
 		OrgID:        c.SignedInUser.GetOrgID(),
 		UserID:       c.QueryInt64("userId"),
 		AlertID:      c.QueryInt64("alertId"),
+		AlertUID:     c.Query("alertUID"),
 		DashboardID:  c.QueryInt64("dashboardId"),
 		DashboardUID: c.Query("dashboardUID"),
 		PanelID:      c.QueryInt64("panelId"),
@@ -744,10 +745,15 @@ type GetAnnotationsParams struct {
 	// in:query
 	// required:false
 	UserID int64 `json:"userId"`
-	// Find annotations for a specified alert.
+	// Find annotations for a specified alert rule by its ID.
+	// deprecated: AlertID is deprecated and will be removed in future versions. Please use AlertUID instead.
 	// in:query
 	// required:false
 	AlertID int64 `json:"alertId"`
+	// Find annotations for a specified alert rule by its UID.
+	// in:query
+	// required:false
+	AlertUID string `json:"alertUID"`
 	// Find annotations that are scoped to a specific dashboard
 	// in:query
 	// required:false