aws.config: skip missing_credentials script test

Author: andrewkroh

packages/aws/data_stream/config/_dev/test/scripts/missing_credentials.txt

@@ -1,6 +1,8 @@
 # Test that the AWS Config data stream emits a clear error event when
 # access_key_id and secret_access_key are not provided.
 
+skip 'conditions.agent.version breaks this test. https://github.com/elastic/elastic-package/pull/3729'
+
 [!external_stack] skip 'Skipping external stack test.'
 [!exec:jq] skip 'Skipping test requiring absent jq command'