Allow customization of the update comment type batch size

[dchymko]

Functionality was added in #49236 to update comment types in batches of 100. This is a good default value, but some users may want to modify this batch size. For example, some hosts may want to have a batch size similar in size to other processing they do via cron.

[SergeyBiryukov]

In 48225:

Comments: Introduce wp_update_comment_type_batch_size filter for the comment batch size in _wp_batch_update_comment_type().

Follow-up to [47597].

Props dchymko.
Fixes #50513. See #49236.

[SergeyBiryukov]

In 48227:

Comments: Correct $wpdb->prepare() usage in _wp_batch_update_comment_type().

Follow-up to [47597], [48225].

See #50513, #49236.

[dchymko]

Replying to SergeyBiryukov:

In 48227:

Comments: Correct $wpdb->prepare() usage in _wp_batch_update_comment_type().

Follow-up to [47597], [48225].

See #50513, #49236.

Thanks for changing that over, that was an improvement on my radar for today but you beat me to it!