[v9.3.x] CloudWatch: Cross-account querying support (#59389)

* add cross-account querying support

* fix tests

pkg/tsdb/cloudwatch/models/resources/resource_request.go

@@ -5,8 +5,15 @@ import (
 	"net/url"
 )
 
+const useLinkedAccountsId = "all"
+
 type ResourceRequest struct {
-	Region string
+	Region    string
+	AccountId *string
+}
+
+func (r *ResourceRequest) ShouldTargetAllAccounts() bool {
+	return r.AccountId != nil && *r.AccountId == useLinkedAccountsId
 }
 
 func getResourceRequest(parameters url.Values) (*ResourceRequest, error) {
@@ -14,9 +21,24 @@ func getResourceRequest(parameters url.Values) (*ResourceRequest, error) {
 		Region: parameters.Get("region"),
 	}
 
+	accountId := parameters.Get("accountId")
+	if accountId != "" {
+		request.AccountId = &accountId
+	}
+
 	if request.Region == "" {
 		return nil, fmt.Errorf("region is required")
 	}
 
 	return request, nil
 }
+
+type LogsRequest struct {
+	Limit                                              int64
+	AccountId, LogGroupNamePrefix, LogGroupNamePattern *string
+	IsCrossAccountQueryingEnabled                      bool
+}
+
+func (r LogsRequest) IsTargetingAllAccounts() bool {
+	return *r.AccountId == useLinkedAccountsId
+}