Changed Metric SLO to support SLI specification

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#4600 Test branch datadog-api-spec/test/may.fu/update-metric-slo-sli-spec

[datadog-official]

⚠️ Tests

✨ Fix all issues with Cursor

⚠️ Warnings

🧪 3 Tests failed

    Create a new metric SLO object using sli_specification returns "OK" response from Service Level Objectives at features/v1/service_level_objectives.feature (Fix with Cursor)

    Create a new metric SLO object using sli_specification returns "OK" response from Service Level Objectives at features/v1/service_level_objectives.feature (Fix with Cursor)

Create a new metric SLO object using sli_specification returns "OK" response from Service Level Objectives at features/v1/service_level_objectives.feature (Datadog) (Fix with Cursor)

Cassette '/home/runner/work/datadog-api-client-ruby/datadog-api-client-ruby/cassettes/features/v1/service_level_objectives/Create-a-new-metric-SLO-object-using-sli-specification-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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