Add bucket_name to template fileds in S3 operators (apache#13973)

Without that it's impossible to create buckets using for example
execution date. And that is quite common case.

airflow/providers/amazon/aws/operators/s3_bucket.py

@@ -39,6 +39,8 @@ class S3CreateBucketOperator(BaseOperator):
     :type region_name: Optional[str]
     """
 
+    template_fields = ("bucket_name",)
+
     @apply_defaults
     def __init__(
         self,
@@ -79,6 +81,8 @@ class S3DeleteBucketOperator(BaseOperator):
     :type aws_conn_id: Optional[str]
     """
 
+    template_fields = ("bucket_name",)
+
     def __init__(
         self,
         bucket_name: str,