chore: add default_version to .repo-metadata.json (#184)

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

* update default_version

Author: parthea

.repo-metadata.json

@@ -1,15 +1,16 @@
 {
-  "name": "clouderrorreporting",
-  "name_pretty": "Cloud Error Reporting",
-  "product_documentation": "https://cloud.google.com/error-reporting",
-  "client_documentation": "https://googleapis.dev/python/clouderrorreporting/latest",
-  "issue_tracker": "https://issuetracker.google.com/savedsearches/559780",
-  "release_level": "beta",
-  "language": "python",
-  "library_type": "GAPIC_COMBO",
-  "repo": "googleapis/python-error-reporting",
-  "distribution_name": "google-cloud-error-reporting",
-  "api_id": "clouderrorreporting.googleapis.com",
-  "requires_billing": false,
-  "codeowner_team": "@googleapis/api-logging"
-}
+    "name": "clouderrorreporting",
+    "name_pretty": "Cloud Error Reporting",
+    "product_documentation": "https://cloud.google.com/error-reporting",
+    "client_documentation": "https://googleapis.dev/python/clouderrorreporting/latest",
+    "issue_tracker": "https://issuetracker.google.com/savedsearches/559780",
+    "release_level": "beta",
+    "language": "python",
+    "library_type": "GAPIC_COMBO",
+    "repo": "googleapis/python-error-reporting",
+    "distribution_name": "google-cloud-error-reporting",
+    "api_id": "clouderrorreporting.googleapis.com",
+    "requires_billing": false,
+    "codeowner_team": "@googleapis/api-logging",
+    "default_version": "v1beta1"
+}