chore: complete google-cloud-vision migration (#16672)

- Reformat with nox
- Enable generation with librarian
- Regenerate with librarian

Author: jskeet

librarian.yaml

@@ -3920,7 +3920,6 @@ libraries:
       - tests/system/smoke_test.py
       - tests/unit/test_decorators.py
       - tests/unit/test_helpers.py
-    skip_generate: true
     python:
       library_type: GAPIC_COMBO
       product_documentation_override: https://cloud.google.com/vision/docs/

packages/google-cloud-vision/.repo-metadata.json

@@ -1,17 +1,16 @@
 {
-  "api_description": "allows developers to easily integrate vision detection features within applications, including image labeling, face and landmark detection, optical character recognition (OCR), and tagging of explicit content.",
-  "api_id": "vision.googleapis.com",
-  "api_shortname": "vision",
-  "client_documentation": "https://cloud.google.com/python/docs/reference/vision/latest",
-  "default_version": "v1",
-  "distribution_name": "google-cloud-vision",
-  "issue_tracker": "https://issuetracker.google.com/issues?q=status:open%20componentid:187174",
-  "language": "python",
-  "library_type": "GAPIC_COMBO",
-  "name": "vision",
-  "name_pretty": "Cloud Vision",
-  "product_documentation": "https://cloud.google.com/vision/docs/",
-  "release_level": "stable",
-  "repo": "googleapis/google-cloud-python",
-  "requires_billing": false
+    "api_description": "allows developers to easily integrate vision detection features within applications, including image labeling, face and landmark detection, optical character recognition (OCR), and tagging of explicit content.",
+    "api_id": "vision.googleapis.com",
+    "api_shortname": "vision",
+    "client_documentation": "https://cloud.google.com/python/docs/reference/vision/latest",
+    "default_version": "v1",
+    "distribution_name": "google-cloud-vision",
+    "issue_tracker": "https://issuetracker.google.com/issues?q=status:open%20componentid:187174",
+    "language": "python",
+    "library_type": "GAPIC_COMBO",
+    "name": "vision",
+    "name_pretty": "Cloud Vision",
+    "product_documentation": "https://cloud.google.com/vision/docs/",
+    "release_level": "stable",
+    "repo": "googleapis/google-cloud-python"
 }

packages/google-cloud-vision/google/cloud/vision/__init__.py

@@ -18,10 +18,10 @@
 __version__ = package_version.__version__
 
 
+from google.cloud.vision_v1 import ImageAnnotatorClient
 from google.cloud.vision_v1.services.image_annotator.async_client import (
     ImageAnnotatorAsyncClient,
 )
-from google.cloud.vision_v1 import ImageAnnotatorClient
 from google.cloud.vision_v1.services.product_search.async_client import (
     ProductSearchAsyncClient,
 )