Merged PR 416: Fix database client uninstall failing due to persistent connection

## Summary
Change the way db client uninstall happens.

Now if a client_connection disconnect fails, we just drop it anyway, not sure if this causes other issues so pls review this diligently, especially @<Charlie Crane> . in case there's a potential issue with not fully dropping connections.

## Test process
pytest is running very nicely

## Checklist
- [x] PR is linked to a **work item**
- [x] **acceptance criteria** of linked ticket are met
- [x] performed **self-review** of the code
- [x] 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**
- [x] ran **pre-commit** checks for code style
- [x] attended to any **TO-DOs** left in the code

Fix database client uninstall failing due to persistent connection

src/primaite/simulator/system/applications/database_client.py

@@ -270,9 +270,16 @@ class DatabaseClient(Application):
 
         Calls disconnect on all client connections to ensure that both client and server connections are killed.
         """
-        while self.client_connections.values():
-            client_connection = self.client_connections[next(iter(self.client_connections.keys()))]
-            client_connection.disconnect()
+        while self.client_connections:
+            conn_key = next(iter(self.client_connections.keys()))
+            conn_obj: DatabaseClientConnection = self.client_connections[conn_key]
+            conn_obj.disconnect()
+            if conn_obj.is_active or conn_key in self.client_connections:
+                self.sys_log.error(
+                    "Attempted to uninstall database client but could not drop active connections. "
+                    "Forcing uninstall anyway."
+                )
+                self.client_connections.pop(conn_key, None)
         super().uninstall()
 
     def get_new_connection(self) -> Optional[DatabaseClientConnection]: