Update the azure template to output ‘emitter-output-dir’ in the tspconfig.yaml

To support the new C# emitter in spec pull requests, we began reviewing the current usage of tsp-client commands and the package-dir option in tspconfig.yaml.
After considering several options and discussing the trade-offs, we've aligned on replacing `package-dir` with `emitter-output-dir` that aims to simplify tspconfig.yaml and ensure consistency between tsp-client and tsp-compile.

We will need to update the template to output the 'emitter-output-dir' in the generated tspconfig.yaml.

Find the template that generates tspconfig.yaml and inspect how it currently emits package-dir. Compare the generated configuration with the tsp-client and tsp-compile usage described in the issue; done means the template outputs emitter-output-dir instead and the generated YAML is valid.

Written by the indexing model from the issue text.