Update public API obs-pipelines endpoints

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#4719 Test branch datadog-api-spec/test/clementd-dd/opa-4223-update-public-api-obs-pipelines-endpoints

[datadog-datadog-prod-us1]

⚠️ Tests

✨ Fix all issues with Cursor

⚠️ Warnings

🧪 3 Tests failed

    List pipelines returns "OK" response from classpath:com/datadog/api/client/v2/api/observability_pipelines.feature:Observability Pipelines (Fix with Cursor)

    List pipelines returns "OK" response from classpath:com/datadog/api/client/v2/api/observability_pipelines.feature:Observability Pipelines (Datadog) (Fix with Cursor)

    List pipelines returns "OK" response from classpath:com/datadog/api/client/v2/api/observability_pipelines.feature:Observability Pipelines (Fix with Cursor)

ℹ️ Info

❄️ No new flaky tests detected

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