Add new endpoint

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#4602 Test branch datadog-api-spec/test/aaron.hoffman/SDCD-1828_add-list-rules-from-gate-public-endpoint

[datadog-official]

⚠️ Tests

⚠️ Warnings

🧪 3 Tests failed

    Get rules for a deployment gate returns "OK" response from Deployment Gates at features/v2/deployment_gates.feature

    Get rules for a deployment gate returns "OK" response from Deployment Gates at features/v2/deployment_gates.feature

Get rules for a deployment gate returns "OK" response from Deployment Gates at features/v2/deployment_gates.feature (Datadog)

Cassette '/home/runner/work/datadog-api-client-ruby/datadog-api-client-ruby/cassettes/features/v2/deployment_gates/Get-rules-for-a-deployment-gate-returns-OK-response.yml' not found: create one setting \`RECORD=true\` or ignore it using \`RECORD=none\`

ℹ️ Info

❄️ No new flaky tests detected

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