Turn off telemetry on CI servers by default?

`npm` and `yarn` and many other tools turn off telemetry on CI servers by default. Partially to reduce the time to run and partially because CI tends to handle IP and secrets.

`az` has the ability to turn off telemetry explicitly by calling

```
az config set collect_telemetry=false --only-show-errors
```

There are a few other settings that are reccomended by the `az-cli` team through the `az init` extension:

```
az config set auto-upgrade.enable=false --only-show-errors
az config set core.error_recommendation=off --only-show-errors
az config set core.disable_progress_bar=true --only-show-errors
az config set core.no_color=true --only-show-errors
az config set output.show_survey_link=no --only-show-errors
az config set logging.enable_log_file=no --only-show-errors
```

I propose `az-cli` should adopt these settings by default, unless explicitly configured otherwise when it detects a CI environment.

It could use similar features as [the `is-ci` node module](https://www.npmjs.com/package/is-ci) or [Python-vw](https://github.com/The-Compiler/pytest-vw/blob/master/pytest_vw.py).