feat: bump release level to stable (#14233)

BEGIN_COMMIT_OVERRIDE
feat: update release level to stable

Release-As: 1.0.0
END_COMMIT_OVERRIDE

Author: parthea

packages/google-shopping-type/.repo-metadata.json

@@ -5,7 +5,7 @@
     "product_documentation": "https://developers.google.com/merchant/api",
     "client_documentation": "https://googleapis.dev/python/google-shopping-type/latest",
     "issue_tracker": "https://github.com/googleapis/google-cloud-python/issues",
-    "release_level": "preview",
+    "release_level": "stable",
     "language": "python",
     "library_type": "GAPIC_AUTO",
     "repo": "googleapis/google-cloud-python",

packages/google-shopping-type/README.rst

@@ -1,14 +1,14 @@
 Python Client for Shopping Type Protos
 ======================================
 
-|preview| |pypi| |versions|
+|stable| |pypi| |versions|
 
 `Shopping Type Protos`_: 
 
 - `Client Library Documentation`_
 - `Product Documentation`_
 
-.. |preview| image:: https://img.shields.io/badge/support-preview-orange.svg
+.. |stable| image:: https://img.shields.io/badge/support-stable-gold.svg
    :target: https://github.com/googleapis/google-cloud-python/blob/main/README.rst#stability-levels
 .. |pypi| image:: https://img.shields.io/pypi/v/google-shopping-type.svg
    :target: https://pypi.org/project/google-shopping-type/