chore: add default_version to .repo-metadata.json (#410)

* chore: add default_version and codeowner_team to .repo-metadata.json

* update default_version

Author: parthea

.repo-metadata.json

@@ -1,14 +1,15 @@
 {
-  "name": "logging",
-  "name_pretty": "Cloud Logging",
-  "product_documentation": "https://cloud.google.com/logging/docs",
-  "client_documentation": "https://googleapis.dev/python/logging/latest",
-  "issue_tracker": "https://issuetracker.google.com/savedsearches/559764",
-  "release_level": "ga",
-  "language": "python",
-  "library_type": "GAPIC_COMBO",
-  "repo": "googleapis/python-logging",
-  "distribution_name": "google-cloud-logging",
-  "api_id": "logging.googleapis.com",
-  "codeowner_team": "@googleapis/api-logging"
-}
+    "name": "logging",
+    "name_pretty": "Cloud Logging",
+    "product_documentation": "https://cloud.google.com/logging/docs",
+    "client_documentation": "https://googleapis.dev/python/logging/latest",
+    "issue_tracker": "https://issuetracker.google.com/savedsearches/559764",
+    "release_level": "ga",
+    "language": "python",
+    "library_type": "GAPIC_COMBO",
+    "repo": "googleapis/python-logging",
+    "distribution_name": "google-cloud-logging",
+    "api_id": "logging.googleapis.com",
+    "codeowner_team": "@googleapis/api-logging",
+    "default_version": "v2"
+}