PublicDashboards: Accept AccessToken for pubdash creation (#74134)

* Add Access token input

* add unit tests to access token

* if else logic to not call find on empty string

* update var naming

pkg/services/publicdashboards/api/api.go

@@ -155,6 +155,12 @@ func (api *Api) CreatePublicDashboard(c *contextmodel.ReqContext) response.Respo
 		return response.Err(ErrInvalidUid.Errorf("CreatePublicDashboard: invalid Uid %s", uid))
 	}
 
+	//validate accessToken
+	accessToken := pdDTO.AccessToken
+	if accessToken != "" && !validation.IsValidAccessToken(accessToken) {
+		return response.Err(ErrInvalidAccessToken.Errorf("CreatePublicDashboard: invalid Access Token %s", accessToken))
+	}
+
 	// Always set the orgID and userID from the session
 	dto := &SavePublicDashboardDTO{
 		UserId:          c.UserID,