fix: add s3 region to assert step (#535)

Author: razvan

tests/templates/kuttl/overrides/06-assert.yaml

@@ -33,6 +33,7 @@ data:
     test.securityProperties.role=role
   spark-defaults.conf: |-
     spark.hadoop.fs.s3a.endpoint https://eventlog-minio:9000/
+    spark.hadoop.fs.s3a.endpoint.region us-east-1
     spark.hadoop.fs.s3a.path.style.access true
     spark.history.fs.cleaner.enabled true
     spark.history.fs.logDirectory s3a://spark-logs/eventlogs/