[pyramid] Don't use unsafe_cnx_context_manager for write queries we may have clumsy error that hide previous problems on attempting to commit the transaction. Closes #16753531

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−.. _rset_module:
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−
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−:mod:`cubicweb.rset`
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−====================
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−
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−.. automodule:: cubicweb.rset
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−
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−    .. autoclass:: ResultSet
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−        :members:
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−