CI/CD - Fix Azure test pipeline (#754)

Python3.10 verification pipeline failed for conflict 'setuptools'
version as below.
<img width="1157" height="622" alt="image"
src="https://github.com/user-attachments/assets/ba0f6045-4b92-4fd8-b92f-1c474725534c

"
/>

Root Cause:
The problem is that modern pip (25.3) uses an isolated build environment
with the latest setuptools by default. The pipeline installs setuptools
65.7 in the user environment, but pip builds the package in an isolated
environment with newer setuptools, which conflicts with the version
check in [setup.py].

Solution:
Remove pip upgrade.

---------
Co-authored-by: Hongtao Zhang <hongtaozhang@microsoft.com>

.azure-pipelines/cpu-unit-test.yml

@@ -27,9 +27,7 @@ steps:
     displayName: Export path
   - 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
+        python3 -m pip install --upgrade setuptools==65.7
       fi
       python3 -m pip install .[test,cpuworker]
       make postinstall

.azure-pipelines/cuda-unit-test.yml

@@ -24,7 +24,7 @@ steps:
         yes '' | apt-get install -y -q sudo && \
         apt-get install -y -q \
         ffmpeg libavcodec-dev libavformat-dev libavutil-dev libboost-program-options-dev libswresample-dev"
-      python3 -m pip install --upgrade pip setuptools==65.7
+      python3 -m pip install --upgrade setuptools==65.7
       python3 -m pip install .[test,nvworker]
       make postinstall
     displayName: Install dependencies