Remove default region from Bedrock config

Remove us-east-2 default for AWS_DEFAULT_REGION to match original behavior

Author: skamenan7

distribution/run.yaml

@@ -24,7 +24,7 @@ providers:
     provider_type: remote::bedrock
     config:
       api_key: ${env.AWS_BEARER_TOKEN_BEDROCK:=}
-      region_name: ${env.AWS_DEFAULT_REGION:=us-east-2}
+      region_name: ${env.AWS_DEFAULT_REGION:=}
   - provider_id: sentence-transformers
     provider_type: inline::sentence-transformers
     config: {}