[Atlassian Confluence][Atlassian Jira][Cisco Secure Endpoint][Okta] Fix CI for snapshot

[moxarth-rathod]

Proposed commit message

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.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Related issues

• Closes [LogsDB] [Stack 8.19.18-SNAPSHOT] [atlassian_confluence] Failing test daily: system test: api in atlassian_confluence.audit #19833, [LogsDB] [Stack 8.19.18-SNAPSHOT] [atlassian_jira] Failing test daily: system test: api in atlassian_jira.audit #19834, [Stack 8.19.18-SNAPSHOT] [cisco_secure_endpoint] Failing test daily: system test: default in cisco_secure_endpoint.event #19854, [Stack 8.19.18-SNAPSHOT] [okta] Failing test daily: system test: api-key in okta.system #19858, [LogsDB] [Stack 8.19.18-SNAPSHOT] [okta] Failing test daily: system test: api-key in okta.system #19841, [LogsDB] [Stack 8.19.18-SNAPSHOT] [okta] Failing test daily: system test: api-key-no-flattened in okta.system #19842, [LogsDB] [Stack 8.19.18-SNAPSHOT] [okta] Failing test daily: system test: oauth2 in okta.system #19843, [LogsDB] [Stack 8.19.18-SNAPSHOT] [okta] Failing test daily: system test: oauth2-pem in okta.system #19844

[infra-vault-gh-plugin-prod]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)

second thoughts

[vera-review-bot]

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[elastic-vault-github-plugin-prod]

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[infra-vault-gh-plugin-prod]

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cc @moxarth-rathod

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