Google Stackdriver should be renamed to Google Operations

### Body

It's been already 5+ years that the Google provider uses the deprecated name "stackdriver", instead of "operations", for its entities (hooks, providers, etc.).
It's a good time to align the relevant entities to the new naming, and deprecate the old ones.
**Please note** that I didn't label this task as a "good first issue", as it needs to be **carefully** done, to avoid accidental breaking changes.

CC: @VladaZakharova @MaksYermak

### Committer

- [x] I acknowledge that I am a maintainer/committer of the Apache Airflow project.

Start by locating the Google provider's hooks and provider entities that still use the Stackdriver name, then review the issue's six-comment history for compatibility concerns. Done means the relevant entities align with Google Operations while the old names are safely deprecated without accidental breaking changes.

Written by the indexing model from the issue text.