Change working directory for breeze unit tests (#31839)

The recent version of pytest released on June 10th introduced
change that it will read conftest tests starting in the directory
which is current working directory, this causes breeze tests run
with working directory being top airflow directory to fail because
it's requirements do not contain a few libraries that are used
in airflow's conftest.py

This change rather than specifying directory at pytest command
line, changes working directory for the tests.

(cherry picked from commit 3206719)

.github/workflows/ci.yml

@@ -384,7 +384,8 @@ jobs:
           cache-dependency-path: ./dev/breeze/setup*
       - run: python -m pip install --editable ./dev/breeze/
       - run: breeze setup version
-      - run: python -m pytest ./dev/breeze/ -n auto --color=yes
+      - run: python -m pytest -n auto --color=yes
+        working-directory: ./dev/breeze/
       - run: breeze setup check-all-params-in-groups
 
   tests-www: