[FIX] web_editor, *: wait for drag & drop ending before saving

*: website

This is not the cleanest of fixes because the original code have to
be refactored first but this solves the problem we had *sometimes*
when drag and dropping a snippet then immediately saving (only saw the
bug in automatic tests): same as all snippet options, the operation had
to be mutexed so that saving is done after its full execution.

Part of https://github.com/odoo/odoo/pull/57975
task-2344227

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