Add api specs for deployment gates

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#4460 Test branch datadog-api-spec/test/aaron.hoffman/SDCD-1873_add-apis-to-openapi-spec

[datadog-official]

⚠️ Tests

⚠️ Warnings

🧪 64 Tests failed

    Create deployment gate returns "Bad Request" response from classpath:com/datadog/api/client/v2/api/deployment_gates.feature:Deployment Gates

Create deployment gate returns "Bad Request" response from classpath:com/datadog/api/client/v2/api/deployment_gates.feature:Deployment Gates (Datadog)

Cannot invoke "java.time.OffsetDateTime.toEpochSecond()" because "this.now" is null

    Create deployment gate returns "Bad Request" response from classpath:com/datadog/api/client/v2/api/deployment_gates.feature:Deployment Gates

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ℹ️ Info

❄️ No new flaky tests detected

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