Update issue template for Unreal and cdb version command

## Context

<!-- Which client did you use? -->

- [ ] Unity

- [ ] Unreal

- [ ] Other

## Your Environment

<!---

`nakama --version` will show the version of the server.

`cockroach --version` will show the version of the Cockroach database server.

`cockroach version` will show the version of the Cockroach database server.

Use `nakama doctor` to collect diagnostics on the server and environment and submit it with your report if possible.

-->

- Nakama: X.X.X