[CI] Sphinx warning should be shown in console

.gitlab-ci.yml

@@ -194,13 +194,13 @@ docs preview [M]:
     - pip install -e .[docs]
     - *pip-setup-extra-headless
   script:
-    - make docs SPHINXOPTS="--keep-going -n -j 4" > sphinx_output.log 2>&1
+    - make docs SPHINXOPTS="--keep-going -n -j 4" | tee sphinx_output.log
     - echo "Counting warnings in Sphinx output..."
     # Count lines with "WARNING" in the Sphinx log
     - warning_count=$(grep -c "WARNING" sphinx_output.log || true)
     - echo "Found $warning_count warnings in Sphinx documentation."
     # Set the warning threshold
-    - warning_threshold=11
+    - warning_threshold=7
     # Check if warnings exceed the threshold
     - if [ "$warning_count" -lt "$warning_threshold" ]; then
         echo "Warnings ($warning_count) are below the threshold ($warning_threshold). Pipeline is green.";