Add new DeleteAssignee endpoint to Error Tracking APIs

[api-clients-generation-pipeline]

See DataDog/datadog-api-spec#4467 Test branch datadog-api-spec/test/camille.jouan/et-delete-assignee

[datadog-official]

⚠️ Tests

⚠️ Warnings

🧪 4 Tests failed

    Remove the assignee of an issue returns "No Content" response from Error Tracking at features/v2/error_tracking.feature (✨ Fix with BitsAI)

    Remove the assignee of an issue returns "No Content" response from Error Tracking at features/v2/error_tracking.feature

    Remove the assignee of an issue returns "Not Found" response from Error Tracking at features/v2/error_tracking.feature (✨ Fix with BitsAI)

Remove the assignee of an issue returns "Not Found" response from Error Tracking at features/v2/error_tracking.feature (Datadog) (✨ Fix with BitsAI)

Cassette '/home/runner/work/datadog-api-client-ruby/datadog-api-client-ruby/cassettes/features/v2/error_tracking/Remove-the-assignee-of-an-issue-returns-Not-Found-response.yml' not found: create one setting \`RECORD=true\` or ignore it using \`RECORD=none\`

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ℹ️ Info

❄️ No new flaky tests detected

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