Chore: Update to the latest grafana-plugin-sdk-go and more swagger fixes (#52445)

* Fix get legacy alert response

* Swagger: Fix get folder by UID response

* Fix conflicting swagger model Alert

Reanme legacy alerting swagger model to LegacyAlert to differentiate it
from the prometheus Alert

* Bump grafana-plugin-sdk-go

* Fix get folder response

* Use go-swagger command for merging the specifications and remove merge_specs script

pkg/api/docs/definitions/folder.go

@@ -22,7 +22,7 @@ import (
 // Get folder by uid.
 //
 // Responses:
-// 200:
+// 200: folderResponse
 // 401: unauthorisedError
 // 403: forbiddenError
 // 404: notFoundError

pkg/api/docs/definitions/legacy_alerting.go

@@ -148,7 +148,7 @@ type GetAlertsResponse struct {
 type GetAlertResponse struct {
 	// The response message
 	// in: body
-	Body []*models.Alert `json:"body"`
+	Body *models.Alert `json:"body"`
 }
 
 // swagger:response pauseAlertResponse

pkg/api/docs/definitions/teams.go

@@ -65,7 +65,7 @@ import (
 // Get Team Members.
 //
 // Responses:
-// 200: okResponse
+// 200: getTeamMembersResponse
 // 401: unauthorisedError
 // 403: forbiddenError
 // 404: notFoundError