Use dedicated elasticsearch image for observabilitySRE smoke testing

The ES team has started publishing a purpose built image for the fedramp high
project. Update our smoke test stack to use this container.

Author: donoghuc

x-pack/distributions/internal/observabilitySRE/qa/smoke/docker/docker-compose.yml

@@ -2,7 +2,7 @@ version: '3'
 
 services:
   elasticsearch:
-    image: docker.elastic.co/elasticsearch/elasticsearch-fips:8.19.0-SNAPSHOT
+    image: docker.elastic.co/elasticsearch/elasticsearch-cloud-ess-fips:8.19.0-SNAPSHOT
     environment:
       - discovery.type=single-node
       - xpack.security.enabled=true