evaluate.py: missing pip package promptflow.azure

> Please provide us with the following information:
> ---------------------------------------------------------------

### This issue is for a: (mark with an `x`)
```
- [x] bug report -> please search issues before submitting
- [ ] feature request
- [x] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```

### Minimal steps to reproduce
> follow instructions https://learn.microsoft.com/en-us/azure/ai-studio/tutorials/copilot-sdk-evaluate-deploy#run-the-evaluation-script
pip install is missing package promptflow.azure
this leads to an exception when running python evaluate.py

The documentation need to be updated:
pip install promptflow-evals
pip install promptflow.azure

### Any log messages given by the failure
>(.venv) PS C:\work\Azure-Samples\rag-data-openai-python-promptflow\tutorial> python .\evaluate.py
Traceback (most recent call last):
File "C:\Users\...\.venv\Lib\site-packages\promptflow\_sdk\_tracing.py", line 107, in validate
from promptflow.azure._utils._tracing import validate_trace_destination
ModuleNotFoundError: No module named 'promptflow.azure'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\work\Azure-Samples\rag-data-openai-python-promptflow\tutorial\evaluate.py", line 80, in
result, tabular_result = run_evaluation(
^^^^^^^^^^^^^^^
File "C:\work\Azure-Samples\rag-data-openai-python-promptflow\tutorial\evaluate.py", line 49, in run_evaluation
result = evaluate(
^^^^^^^^^
File "C:\Users\...\.venv\Lib\site-packages\promptflow\evals\evaluate\_telemetry\__init__.py", line 115, in wrapper
pf_client = PFClient(
^^^^^^^^^

### Expected/desired behavior
> pip install promptflow.azure

### OS and Version?
> Windows 7, 8 or 10. Linux (which distribution). macOS (Yosemite? El Capitan? Sierra?)

### Versions
>

### Mention any other details that might be useful

> ---------------------------------------------------------------
> Thanks! We'll be in touch soon.

Start with the linked Copilot SDK evaluation tutorial and compare its installation commands with tutorial/evaluate.py, especially the imports and call to run_evaluation. Update the documented setup so the required package is installed, then follow the tutorial and run python evaluate.py to confirm the missing promptflow.azure error is resolved.

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