Mark required type fields in User and Roles API v2

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#551

[jirikuncar]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #467 into master will increase coverage by 26.04%.
The diff coverage is 13.51%.

Impacted Files	Coverage Δ
...datadog/model_relationship_to_organization_data.go	0.00% <0.00%> (ø)
api/v2/datadog/model_relationship_to_user_data.go	25.00% <23.80%> (+25.00%)	⬆️
...pi/v1/datadog/model_usage_billable_summary_keys.go	0.60% <0.00%> (+0.60%)	⬆️
api/v2/datadog/utils.go	0.69% <0.00%> (+0.69%)	⬆️
...1/datadog/model_synthetics_api_test_result_data.go	1.02% <0.00%> (+1.02%)	⬆️
api/v2/datadog/model_log_attributes.go	1.37% <0.00%> (+1.37%)	⬆️
api/v2/datadog/model_logs_response_metadata.go	1.80% <0.00%> (+1.80%)	⬆️
...el_synthetics_trigger_ci_tests_response_results.go	2.12% <0.00%> (+2.12%)	⬆️
api/v2/datadog/model_role_update_response_data.go	2.15% <0.00%> (+2.15%)	⬆️
api/v1/datadog/model_ip_ranges.go	2.23% <0.00%> (+2.23%)	⬆️
... and 446 more