[5.x] Improve performance of the data reference updaters

[duncanmcclean]

This pull request makes some performance improvements to the GetsItemsContainingData trait, responsible for gathering all content items (all entries, terms, globals and users).

It's currently used within the asset & term reference updaters, however, it'll soon be used in the UTC dates update script (#11409).

Essentially, instead of loading all items into memory at once (which will cause issues with larger sites), we'll use Laravel's Lazy Collections feature to ensure items can be looped through in a more efficient manner.