Add a limit to the number of results in _node_reference_options(). [#1345920]

When _node_reference_options() does execute node_reference_potential_references(), it doesn't pass in any options, wich means that the defaults are used. The default set limit to 0, which means no limitation at all. If you have ~400k nodes, like we do, then it explodes. The attached patch sets the default limit to 10 instead, not sure if a different value should be chosen, but there needs to be something.

indexing - Sitecore Azure Search - There is no appropriate index for /sitecore - {11111111-1111-1111-1111-111111111111} - Sitecore Stack Exchange

request help: apisix.plugins.limit-count.limit-count-redis performance downgraded for continuous pressure · Issue #1111 · apache/apisix · GitHub

SDK undefined reference to 'exp