Implement storage exists method

Author: soerenreichardt

compatibility/5.1/storage-engine-adapter/src/main/java/org/neo4j/gds/compat/_51/InMemoryStorageEngineFactory.java

@@ -143,7 +143,7 @@ public List<Path> listStorageFiles(FileSystemAbstraction fileSystem, DatabaseLay
 
     @Override
     public boolean storageExists(FileSystemAbstraction fileSystem, DatabaseLayout databaseLayout, PageCache pageCache) {
-        throw new UnsupportedOperationException("5.1 storage engine requires JDK17");
+        return false;
     }
 
     @Override

compatibility/5.2/storage-engine-adapter/src/main/java/org/neo4j/gds/compat/_52/InMemoryStorageEngineFactory.java

@@ -143,7 +143,7 @@ public List<Path> listStorageFiles(FileSystemAbstraction fileSystem, DatabaseLay
 
     @Override
     public boolean storageExists(FileSystemAbstraction fileSystem, DatabaseLayout databaseLayout, PageCache pageCache) {
-        throw new UnsupportedOperationException("5.2 storage engine requires JDK17");
+        return false;
     }
 
     @Override

compatibility/5.3/storage-engine-adapter/src/main/java/org/neo4j/gds/compat/_53/InMemoryStorageEngineFactory.java

@@ -143,7 +143,7 @@ public List<Path> listStorageFiles(FileSystemAbstraction fileSystem, DatabaseLay
 
     @Override
     public boolean storageExists(FileSystemAbstraction fileSystem, DatabaseLayout databaseLayout, PageCache pageCache) {
-        throw new UnsupportedOperationException("5.3 storage engine requires JDK17");
+        return false;
     }
 
     @Override

compatibility/5.4/storage-engine-adapter/src/main/java/org/neo4j/gds/compat/_54/InMemoryStorageEngineFactory.java

@@ -143,7 +143,7 @@ public List<Path> listStorageFiles(FileSystemAbstraction fileSystem, DatabaseLay
 
     @Override
     public boolean storageExists(FileSystemAbstraction fileSystem, DatabaseLayout databaseLayout, PageCache pageCache) {
-        throw new UnsupportedOperationException("5.4 storage engine requires JDK17");
+        return false;
     }
 
     @Override

compatibility/5.5/storage-engine-adapter/src/main/java/org/neo4j/gds/compat/_55/InMemoryStorageEngineFactory.java

@@ -143,7 +143,7 @@ public List<Path> listStorageFiles(FileSystemAbstraction fileSystem, DatabaseLay
 
     @Override
     public boolean storageExists(FileSystemAbstraction fileSystem, DatabaseLayout databaseLayout, PageCache pageCache) {
-        throw new UnsupportedOperationException("5.5 storage engine requires JDK17");
+        return false;
     }
 
     @Override