Add 409 response to unarchive feature flag

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#6432 Test branch datadog-api-spec/test/dd/blake.thomas/unarchive-flag-409-conflict

[datadog-datadog-prod-us1-2]

 

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🧪 All tests passed
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[github-actions]

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[dd-prapprover-prod-77c48c]

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🛠️ PRApproval Status

• ✅ PR is eligible for auto-approval by rule datadog-api-spec-generated-clients - 2026-09-18T00:27:40Z
• ✅ CI tests passed - 2026-09-18T00:27:44Z
• ✅ Approved (commit: 5f0ede1) - 2026-09-18T00:27:46Z
• Manual merge required: this rule does not auto-merge.

➡️ Current phase: approved - manual merge required (this rule does not auto-merge)

[dd-prapprover-prod-77c48c]

This PR has been automatically approved by the DD PR Approver bot.

[nogates]

Closing because this PR was generated by the pre-migration DataDog/datadog-api-spec