Merged PR 380: #2561 - Set the DatabaseServer service to automatically install the FTPClient

## Summary
- Set the DatabaseServer service to automatically install the upon install to enable backup. Added some defensive statements that gracefully handle backup/restore requests when FTPClient is not installed.

## Test process
Added test that installs `DatabaseServer` on a new node then checks for an installed `FTPClient`.

## Checklist
- [ ] PR is linked to a **work item**
- [ ] **acceptance criteria** of linked ticket are met
- [ ] performed **self-review** of the code
- [ ] written **tests** for any new functionality added with this PR
- [ ] updated the **documentation** if this PR changes or adds functionality
- [ ] written/updated **design docs** if this PR implements new functionality
- [ ] updated the **change log**
- [ ] ran **pre-commit** checks for code style
- [ ] attended to any **TO-DOs** left in the code

#2561 - Set the DatabaseServer service to automatically install the  upon install to enable backup. Added some defensive statements that gracefully handle backup/restore requests when FTPClient is not

Related work items: #2561, #2570

tests/integration_tests/system/test_database_on_node.py

@@ -356,3 +356,9 @@ def test_client_connection_terminate_does_not_terminate_another_clients_connecti
 
     assert db_connection_b.query("SELECT")
     assert len(db_service.connections) == 1
+
+
+def test_database_server_install_ftp_client():
+    server = Server(hostname="db_server", ip_address="192.168.1.2", subnet_mask="255.255.255.0", start_up_duration=0)
+    server.software_manager.install(DatabaseService)
+    assert server.software_manager.software.get("FTPClient")