Publish DEM Journey APIs

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#6576 Test branch datadog-api-spec/test/dd-spells/public-dem-journey-api

[dd-prapprover-prod-77c48c]

PRApprover will approve and merge this PR, FAQ, #dx-source-code-management

🛠️ PRApproval Status

• ✅ PR is eligible for auto-approval by rule datadog-api-spec-generated-clients - 2026-09-01T22:02:58Z
• ⬜ CI tests passed
• ⬜ Approved
• Manual merge required: this rule does not auto-merge.

➡️ Current phase: CI tests failed. Please fix the failing tests and rerun the workflow, click Workflow Link -> Workflow Starter Link -> Start Workflow

[dd-spells]

The Python 3.8 job has failed twice before any API assertions because the generated replay server exits during fixture startup (Generated test server exited early), cascading into 1,735 unrelated setup errors. Python 3.12 on Ubuntu and macOS, pre-commit, examples, and build all pass. The unrelated generated PR #3951 is currently failing the identical Python 3.8 replay-server startup path, so this appears to be a repository-wide runner/test-server issue rather than a DEM Journey spec or generated-client issue. Could a client maintainer please advise on override/retry for this check?