Extend Widget time schema with support for hide_incomplete_cost_data

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#4250 Test branch datadog-api-spec/test/anna.chang/add-hide-incomplete-cost-data-v3

[datadog-official]

⚠️ Tests

⚠️ Warnings

🧪 2 Tests failed

    Create a new timeseries widget with hide incomplete cost data from Dashboards at features/v1/dashboards.feature

Create a new timeseries widget with hide incomplete cost data from Dashboards at features/v1/dashboards.feature (Datadog)

Cassette '/home/runner/work/datadog-api-client-ruby/datadog-api-client-ruby/cassettes/features/v1/dashboards/Create-a-new-timeseries-widget-with-hide-incomplete-cost-data.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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