Fix insurance qty subscription

Add parent_sku in quoteItem alma_insurance Data and subscribe insurance with insurance product

Make an order with 3 product and 2 insurance, invoice it and check in neat portal if you have only 2 insurance

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[X] The title of the PR uses business wording, not technical jargon, for the changelog readers to understand it
[X] The PR implements the changes asked in the referenced task / issue
[X] The automated tests are compliant with the testing strategy
[X] The tests are relevant, and cover the corner/error cases, not only the happy path
[X] You understand the impact of this PR on existing code/features
[X] The changes include adequate logging and Datadog traces

alma / alma-monthlypayments-magento2