Glue: Fix creating duplicated data links created by Correlations (#65490)

* Ensure correlations do not create duplicated data links

* Remove correlation links before processing each correlation

* Improve test coverage

packages/grafana-data/src/types/dataLink.ts

@@ -12,6 +12,15 @@ export interface DataLinkClickEvent<T = any> {
   e?: any; // mouse|react event
 }
 
+/**
+ * Data Links can be created by data source plugins or correlations.
+ * Origin is set in DataLink object and indicates where the link was created.
+ */
+export enum DataLinkConfigOrigin {
+  Datasource = 'Datasource',
+  Correlations = 'Correlations',
+}
+
 /**
  * Link configuration. The values may contain variables that need to be
  * processed before showing the link to user.
@@ -39,6 +48,8 @@ export interface DataLink<T extends DataQuery = any> {
   // more custom onClick behaviour if needed.
   // @internal and subject to change in future releases
   internal?: InternalDataLink<T>;
+
+  origin?: DataLinkConfigOrigin;
 }
 
 /** @internal */