Add changelog for BigQuery dataset replication feature (#5)

* Add changelog for BigQuery dataset replication feature

* Delete dbt-bigquery/.changes/unreleased/Features-20251015-174021.yaml

* Delete dbt-bigquery/.changes/unreleased/Features-20251015-174436.yaml

* Delete dbt-bigquery/.changes/unreleased/Fixes-20251009-141523.yaml

Author: gavin-burns-US

dbt-bigquery/.changes/unreleased/Features-20251015-174512.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: Add BigQuery dataset replication configuration support
+time: 2025-10-15T17:45:12.24332-04:00
+custom:
+    Author: gavin-burns-US
+    Issue: "1392"