minimize pip installs before test install and run pip check

PiperOrigin-RevId: 780102684
Change-Id: I4b4431cfb6353064529cde4890ff709c1afb387b

Author: jagapiou

.github/workflows/pypi-publish.yml

@@ -85,13 +85,14 @@ jobs:
         run: |
           pip install --upgrade pip
           pip install --upgrade setuptools
-          pip install pytest-xdist
       - name: Install source distribution
         run: |
           pip install dist/*.tar.gz
           pip list
+          pip check
       - name: Test source distribution
         run: |
+          pip install pytest-xdist
           pytest -n auto --pyargs meltingpot
 
   publish: