[Bug]: `tsp init` suggests running `tsp compile .` on non-compilable templates

### Describe the bug

When generating an emitter or library via `tsp init`, the success message ends with `Run tsp compile . to build the project.` despite `tsp compile` not working on these types of projects.

### Reproduction

1. Run `tsp init`
2. Select `TypeSpec library` or `TypeSpec emitter` as the template
3. Observe `Run tsp compile . to build the project.`

### Checklist

- [x] Follow our [Code of Conduct](https://github.com/microsoft/typespec/blob/main/CODE_OF_CONDUCT.md)
- [x] Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
- [x] Check that this is a concrete bug. For Q&A open a [GitHub Discussion](https://github.com/Microsoft/typespec/discussions).
- [x] The provided reproduction is a [minimal reproducible example](https://stackoverflow.com/help/minimal-reproducible-example) of the bug.