[15.0][IMP] attachment_s3: add skip_objects_deletion

[jjscarafia]

Port of https://github.com/camptocamp/odoo-cloud-platform/pull/283/

[vrenaville]

I'm not against, it's a minimal impact, It may lead to a lot of dead object in the storage. but this issue can be managed outside of odoo

[github-actions[bot]]

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