[notifications] use non-fixed message-id for EntityUpdatedNotificationView More than one of those can be sent for a given entity, so they shouldn't all have the same message-id. Closes #4962712.

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−#! /bin/sh -e
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−#
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−
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−if [ "$1" = remove -o "$1" = upgrade ]; then
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−  if which install-docs >/dev/null 2>&1; then
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−    install-docs -r cubicweb-doc
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−  fi
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−fi
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−
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−#DEBHELPER#
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−
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−exit 0