[Testing] 7.x Disable geoip downloader (elastic#25272)

Disable database updates via an Elasticsearch property ingest.geoip.downloader.enabled: false. This will cause Elasticsearch to use the circa 2019 maxmind database version that is embedded. This would work for now, but the embedded database will be removed in 8.x IIUC.

This prevents our golden file tests from failing everytime the database changes geo or asn values. It also prevents race conditions in tests that might run before the database has been updated or in cases where the downloader service is unavailable.

Closes: elastic#25159
(cherry picked from commit 3b4b10e)

testing/environments/snapshot.yml

@@ -14,6 +14,9 @@ services:
     - "transport.host=127.0.0.1"
     - "http.host=0.0.0.0"
     - "xpack.security.enabled=false"
+    # Disable geoip updates to prevent golden file test failures when the database
+    # changes and prevent race conditions between tests and database updates.
+    - "ingest.geoip.downloader.enabled=false"
 
   logstash:
     image: docker.elastic.co/logstash/logstash:7.13.0-SNAPSHOT