fix: remove unregistered Windows App SDK PyPI dependencies (dependency confusion)

[x4v13r64]

Summary

This PR removes Python package names from requirements.txt and pyproject.toml files that do not exist on PyPI and are therefore squattable by an attacker (dependency confusion).

Affected packages and files:

• onnxruntime-winml — removed from:
  • WindowsAppSDK-Samples/2.0-stable/WindowsML/python/SqueezeNetPython/requirements.txt
  • WindowsAppSDK-Samples/1.8-stable/WindowsML/python/SqueezeNetPython/requirements.txt
• winappsdk-Foundation, winappsdk-InteractiveExperiences — removed from:
  • WindowsAppSDK-ProjectTemplates/python/sparse/pyproject.toml
  • WindowsAppSDK-ProjectTemplates/python/unpackaged/pyproject.toml
  • WindowsAppSDK-ProjectTemplates/python/packaged/pyproject.toml

None of these packages are published to PyPI. When a developer runs pip install -r requirements.txt or pip install . (for the templates), pip queries PyPI for each listed name. An attacker can register these names on PyPI and have arbitrary code executed on the installing machine.

Comments have been added in each file directing users to the correct Windows App SDK distribution channel.

Test plan

• Verify pip install -r WindowsAppSDK-Samples/2.0-stable/WindowsML/python/SqueezeNetPython/requirements.txt no longer attempts to fetch onnxruntime-winml from PyPI
• Verify pip install -r WindowsAppSDK-Samples/1.8-stable/WindowsML/python/SqueezeNetPython/requirements.txt no longer attempts to fetch onnxruntime-winml from PyPI
• Verify pip install . in each ProjectTemplates directory no longer attempts to fetch winappsdk-Foundation or winappsdk-InteractiveExperiences from PyPI

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