[server-ce] tests: add jenkins integration (#27600)

* [server-ce] remove unused CE_CUSTOM_3 shard

* [server-ce] tests: add jenkins integration

* [server-ce] tests: log failed host-admin requests in CI

* [server-ce] tests: attempt at reducing flakiness in Cloud Build

GitOrigin-RevId: 8d999efe1ccf041dca148bc8710dddb8561614ab

server-ce/test/docker-compose.yml

@@ -103,6 +103,7 @@ services:
       - /var/run/docker.sock:/var/run/docker.sock
     stop_grace_period: 0s
     environment:
+      CI:
       PWD:
       CYPRESS_SHARD:
       COMPOSE_PROJECT_NAME:
@@ -110,9 +111,6 @@ services:
       ALL_TEX_LIVE_DOCKER_IMAGES:
       IMAGE_TAG_CE: ${IMAGE_TAG_CE:-sharelatex/sharelatex:latest}
       IMAGE_TAG_PRO: ${IMAGE_TAG_PRO:-quay.io/sharelatex/sharelatex-pro:latest}
-    depends_on:
-      mongo:
-        condition: service_healthy
     healthcheck:
       test: curl --fail http://localhost/status
       interval: 3s