[Atlassian Confluence][Atlassian Jira][Cisco Secure Endpoint][Okta] Fix CI for snapshot (#20097)

Set the mock service hostname to svc-<service> for atlassian_confluence,
atlassian_jira, cisco_secure_endpoint, and okta so stream-generated
absolute Link/next URLs match the origin injected into system test
configs, fixing flaky pagination in system tests.

Author: moxarth-rathod

packages/atlassian_confluence/_dev/deploy/docker/docker-compose.yml

@@ -8,6 +8,7 @@ services:
     command: /bin/sh -c "cp /sample_logs/*.log /var/log/"
   confluence-api:
     image: docker.elastic.co/observability/stream:v0.18.0
+    hostname: svc-confluence-api
     ports:
       - 8080
     volumes:

packages/atlassian_jira/_dev/deploy/docker/docker-compose.yml

@@ -8,6 +8,7 @@ services:
     command: /bin/sh -c "cp /sample_logs/*.log /var/log/"
   jira-api:
     image: docker.elastic.co/observability/stream:v0.18.0
+    hostname: svc-jira-api
     ports:
       - 8080
     volumes:

packages/cisco_secure_endpoint/_dev/deploy/docker/docker-compose.yml

@@ -2,6 +2,7 @@ version: '2.3'
 services:
   cisco_secure_endpoint:
     image: docker.elastic.co/observability/stream:v0.18.0
+    hostname: svc-cisco_secure_endpoint
     ports:
       - 8080
     volumes:

packages/okta/_dev/deploy/docker/docker-compose.yml

@@ -2,6 +2,7 @@ version: '2.3'
 services:
   okta:
     image: docker.elastic.co/observability/stream:v0.20.0
+    hostname: svc-okta
     ports:
       - 8080
     volumes:
@@ -14,6 +15,7 @@ services:
       - --config=/files/config.yml
   okta-oauth2:
     image: docker.elastic.co/observability/stream:v0.20.0
+    hostname: svc-okta-oauth2
     ports:
       - 8080
     volumes: