[14.0][project_key] breaks odoo sales order's service tracking workflow

[ygol]

Create a product and set service tracking to "create a task in sales order's project"

add the product to a sales order.

Unable to validate the SO. Error that project key must be unique.

[ygol]

This https://github.com/OCA/project/pull/756 should solve it

[github-actions[bot]]

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