Replace ddev with pytest in experimental workflow

.github/workflows/experimental.yml

@@ -177,34 +177,10 @@ jobs:
           echo "PATH=$(pwd)/python_dir:$PATH" >> $GITHUB_ENV
         fi
 
-    - name: Install pip
+    - name: Install pip and pytest
       run: |
         python -m ensurepip
-
-    - name: Restore cache
-      uses: actions/cache/restore@v4
-      with:
-        path: ${{ runner.os == 'Windows' && '~\AppData\Local\pip\Cache' || '~/.cache/pip' }}
-        key: >-
-          ${{ format(
-            'v01-python-{0}-{1}-{2}-{3}',
-            env.pythonLocation,
-            hashFiles('datadog_checks_base/pyproject.toml'),
-            hashFiles('datadog_checks_dev/pyproject.toml'),
-            hashFiles('ddev/pyproject.toml')
-          )}}
-        restore-keys: |-
-          v01-python-${{ env.pythonLocation }}
-
-    - name: Install ddev from local folder
-      run: |
-        python.exe -m pip install -e ./datadog_checks_dev[cli]
-        python.exe -m pip install -e ./ddev
-
-    - name: Configure ddev
-      run: |
-        ddev config set repos.core .
-        ddev config set repo core
+        pip install pytest
 
     - name: Test
       if: runner.os == 'Windows'