[Woo POS] Add tracking when pagination response headers are missing

[jaclync]

Ref: #14728 (comment)

In the discussion about whether to throw an error when response headers are missing for pagination support, we want to evaluate whether the fallback implementation is worthwhile. We will add tracking when the pagination response headers are missing from the POS products API request.

After a month or so with data tracking, if the percentage is almost zero (like < 1%), we can remove the fallback implementation and throw an error in case of missing pagination headers.

[dangermattic]

Thanks for reporting! 👍