CI/CD - Remove pip upgrade from Azure test pipelines

[Copilot]

Python 3.10 verification pipeline failed due to setuptools version conflict. Modern pip (25.3+) uses isolated build environments with latest setuptools by default, conflicting with the explicitly installed setuptools 65.7 in the user environment.

Changes

• Removed pip install --upgrade pip from both CPU and CUDA test pipelines
• Removed --no-build-isolation flag previously added as workaround
• Kept setuptools 65.7 installation for Python < 3.11 where required by setup.py

Before

- script: |
    if python3 -c "import sys; exit(0 if sys.version_info < (3, 11) else 1)"; then
      python3 -m pip install --upgrade pip setuptools==65.7
    else
      python3 -m pip install --upgrade pip
    fi
    python3 -m pip install --no-build-isolation .[test,cpuworker]

After

- script: |
    if python3 -c "import sys; exit(0 if sys.version_info < (3, 11) else 1)"; then
      python3 -m pip install --upgrade setuptools==65.7
    fi
    python3 -m pip install .[test,cpuworker]

Pip upgrade was the root cause—removing it allows pip's default build isolation to work correctly without version conflicts.

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