[Docs]: add troubleshooting article for mongo connection timed out

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This is just a trouble shooting article. Just more like a FYI

```
MongoServerSelectionError: Server selection timed out after 30000 ms
07:41:43 GMT""]}}"
1709278933875,Error trying to check replicaset MongoServerSelectionError: Server selection timed out after 30000 ms
1709278933875, at Timeout._onTimeout (/opt/appsmith/utils/node_modules/mongodb/lib/sdam/topology.js:278:38)
under this we can write that.
```

Incase, you connect to external mongo please ensure the security groups have the appropriate rules to allow inbound and outbound traffic to mongo