This update simplifies internal spreadsheet edition code by removing unnecessary waiting logic around single background operations. It does not change what users see, but it keeps the code easier to maintain and less prone to avoidable complexity.

both `Promise.all` are useless here since there is only one promise.

Several Odoo business apps were updated to work with the newer content editor used for emails, appointments, appraisals, approvals, payroll, and Knowledge. This keeps existing editing features working while simplifying email formatting behind the scenes and preparing the platform for removal of the older editor.