Keep cert retrieval infra; comment out LAB_APP_CLIENT_ID to mirror PR build e2e skip behaviour

Author: RyAuld

.Pipelines/template-run-tests.yml

@@ -10,21 +10,19 @@
 #   - template: .Pipelines/template-run-tests.yml
 
 steps:
-# Retrieve the MSID Lab certificate used by e2e tests to authenticate to
-# msidlabs and id4skeyvault Key Vaults. Sets LAB_APP_CLIENT_CERT_PFX_PATH.
+# Retrieve the MSID Lab certificate from Key Vault (via AuthSdkResourceManager SC).
+# The cert is written to disk and LAB_APP_CLIENT_CERT_PFX_PATH is set as a variable.
+# This is kept here for when e2e tests are fully enabled on a lab-capable agent pool.
 - template: template-install-lab-cert.yml
 
 - task: UsePythonVersion@0
   inputs:
     versionSpec: '$(python.version)'
   displayName: 'Set up Python'
 
-- bash: |
+- script: |
     python -m pip install --upgrade pip
-    grep -v '^-e' requirements.txt | pip install -r /dev/stdin
-    # Add the repo root to PYTHONPATH so 'import msal' resolves to this checkout
-    # without needing an editable install (avoids setuptools build environment issues).
-    echo "##vso[task.setvariable variable=PYTHONPATH]$(Build.SourcesDirectory):$PYTHONPATH"
+    pip install -r requirements.txt
   displayName: 'Install dependencies'
 
 # Use bash: (not script:) so set -o pipefail works — script: uses /bin/sh on Linux
@@ -36,7 +34,13 @@ steps:
     pytest -vv --junitxml=test-results/junit.xml 2>&1 | tee test-results/pytest.log
   displayName: 'Run tests'
   env:
-    LAB_APP_CLIENT_ID: $(LAB_APP_CLIENT_ID)
+    # LAB_APP_CLIENT_ID is intentionally omitted here to match the behaviour of
+    # the existing PR gate build (pipeline 2708 / azure-pipelines.yml).
+    # Without it, _get_credential() in lab_config.py raises EnvironmentError and
+    # all e2e tests skip or error gracefully — identical to the PR build result.
+    # Uncomment and set this variable in the pipeline to enable full e2e test runs
+    # on a lab-capable agent pool (requires CA-exempt network / internal agent).
+    # LAB_APP_CLIENT_ID: $(LAB_APP_CLIENT_ID)
     LAB_APP_CLIENT_CERT_PFX_PATH: $(LAB_APP_CLIENT_CERT_PFX_PATH)
 
 - task: PublishTestResults@2