[PR Workflow] Use more labels for new TypeSpec identification

Currently we lack of insights on the PRs for newly added product and services. I propose we add similar logic to labeller:

1. `new product`. This gets added whenever new folders are created under the `specification` folder in PR. ie. `specifications/sphere`
2. `new service`. This gets added whenever new **folders** are created:
- directly under `specifications/[product]` eg `specifications/sphere/Sphere.Management`. This is to catch new TypeSpec specs
- directly under `specifications/[product]\data-plane`. This is to catch new data-plane swaggers
- directly under `specifications/[product]\resource-manager` This is to catch new ARM swaggers

With these labels and in conjunction with TypeSpec, we can easily spot TypeSpec adoption violations for the reviewer and BI later.