Bulk api fixes

[ColonelThirtyTwo]

Fixed two issues with some bulk APIs

• A few functions took Fn when they could be taking FnOnce.
• Remove unused TId type parameter from BulkRawOperation::update_script_fluent

[mwilliammyers]

Thanks for the PR @ColonelThirtyTwo!

So this is a breaking change, @KodrAus what is our pre 1.0 breaking change policy?

Although, I think the closure change is a pretty small breaking change - not sure if you could/would want to call those closures more than once?

[KodrAus]

Right now we're still pushing out preview releases so I've been making breaking changes as needed between them 🙂