chore: add test coverage for debug logging

Author: ohmayr

.github/workflows/tests.yaml

@@ -58,6 +58,12 @@ jobs:
         # TODO(https://github.com/googleapis/gapic-generator-python/issues/2121) Remove `showcase_w_rest_async` target when async rest is GA.
         python: ["3.7", "3.13"]
         target: [showcase, showcase_alternative_templates, showcase_w_rest_async]
+        include:
+          - name: With logging Enabled
+            GOOGLE_SDK_PYTHON_LOGGING_SCOPE: "google"
+          - name: With Logging Disabled
+            GOOGLE_SDK_PYTHON_LOGGING_SCOPE: ""
+
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
@@ -143,6 +149,11 @@ jobs:
         python: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         # TODO(https://github.com/googleapis/gapic-generator-python/issues/2121) Remove `_w_rest_async` variant when async rest is GA.
         variant: ['', _alternative_templates, _mixins, _alternative_templates_mixins, _w_rest_async]
+        include:
+          - name: With logging Enabled
+            GOOGLE_SDK_PYTHON_LOGGING_SCOPE: "google"
+          - name: With Logging Disabled
+            GOOGLE_SDK_PYTHON_LOGGING_SCOPE: ""
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4