linstor: implement missing deleteDatastore (apache#10561)

Somehow deleteDatastore was never implemented, that meant:
templates haven't been cleaned up on datastore delete and
also agents have never been informed about storage pool removal.

Author: rp-

plugins/storage/volume/linstor/CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to Linstor CloudStack plugin will be documented in this file
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [2025-03-13]
+
+### Fixed
+
+- Implemented missing delete datastore, to correctly cleanup on datastore removal
+
 ## [2025-02-21]
 
 ### Fixed

plugins/storage/volume/linstor/src/main/java/org/apache/cloudstack/storage/datastore/lifecycle/LinstorPrimaryDataStoreLifeCycleImpl.java

@@ -287,7 +287,10 @@ public boolean cancelMaintain(DataStore store) {
 
     @Override
     public boolean deleteDataStore(DataStore store) {
-        return dataStoreHelper.deletePrimaryDataStore(store);
+        if (cleanupDatastore(store)) {
+            return dataStoreHelper.deletePrimaryDataStore(store);
+        }
+        return false;
     }
 
     /* (non-Javadoc)