feat(tests): introduce a test "suite" concept to encompass dirs, options (#3339)

Our integration tests need to be 'grouped' because each group often
needs a specific set of models it works with. We separated vision tests
due to this, and we have a separate set of tests which test "Responses"
API.

This PR makes this system a bit more official so it is very easy to
target these groups and apply all testing infrastructure towards all the
groups (for example, record-replay) uniformly.

There are three suites declared:
- base
- vision
- responses

Note that our CI currently runs the "base" and "vision" suites.

You can use the `--suite` option when running pytest (or any of the
testing scripts or workflows.) For example:
```
OLLAMA_URL=http://localhost:11434 \
  pytest -s -v tests/integration/ --stack-config starter --suite vision
```

.github/workflows/integration-tests.yml

@@ -1,6 +1,6 @@
 name: Integration Tests (Replay)
 
-run-name: Run the integration test suite from tests/integration in replay mode
+run-name: Run the integration test suites from tests/integration in replay mode
 
 on:
   push:
@@ -32,14 +32,6 @@ on:
         description: 'Test against a specific provider'
         type: string
         default: 'ollama'
-      test-subdirs:
-        description: 'Comma-separated list of test subdirectories to run'
-        type: string
-        default: ''
-      test-pattern:
-        description: 'Regex pattern to pass to pytest -k'
-        type: string
-        default: ''
 
 concurrency:
   # Skip concurrency for pushes to main - each commit should be tested independently
@@ -50,7 +42,7 @@ jobs:
 
   run-replay-mode-tests:
     runs-on: ubuntu-latest
-    name: ${{ format('Integration Tests ({0}, {1}, {2}, client={3}, vision={4})', matrix.client-type, matrix.provider, matrix.python-version, matrix.client-version, matrix.run-vision-tests) }}
+    name: ${{ format('Integration Tests ({0}, {1}, {2}, client={3}, {4})', matrix.client-type, matrix.provider, matrix.python-version, matrix.client-version, matrix.test-suite) }}
 
     strategy:
       fail-fast: false
@@ -61,7 +53,7 @@ jobs:
         # Use Python 3.13 only on nightly schedule (daily latest client test), otherwise use 3.12
         python-version: ${{ github.event.schedule == '0 0 * * *' && fromJSON('["3.12", "3.13"]') || fromJSON('["3.12"]') }}
         client-version: ${{ (github.event.schedule == '0 0 * * *' || github.event.inputs.test-all-client-versions == 'true') && fromJSON('["published", "latest"]') || fromJSON('["latest"]') }}
-        run-vision-tests: [true, false]
+        test-suite: [base, vision]
 
     steps:
       - name: Checkout repository
@@ -73,15 +65,13 @@ jobs:
           python-version: ${{ matrix.python-version }}
           client-version: ${{ matrix.client-version }}
           provider: ${{ matrix.provider }}
-          run-vision-tests: ${{ matrix.run-vision-tests }}
+          test-suite: ${{ matrix.test-suite }}
           inference-mode: 'replay'
 
       - name: Run tests
         uses: ./.github/actions/run-and-record-tests
         with:
-          test-subdirs: ${{ inputs.test-subdirs }}
-          test-pattern: ${{ inputs.test-pattern }}
           stack-config: ${{ matrix.client-type == 'library' && 'ci-tests' || 'server:ci-tests' }}
           provider: ${{ matrix.provider }}
           inference-mode: 'replay'
-          run-vision-tests: ${{ matrix.run-vision-tests }}
+          test-suite: ${{ matrix.test-suite }}