shared: move NM_UTILS_ERROR to shared-utils
NM_UTILS_ERROR is our way to say, that we don't care about the GError domain and code. nmcli sometimes passes domain "1" and code "0" to g_set_error(), which could be considered a bug. We usually don't care about the error but only about the error message, so let's have a universally available error quark around.
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