Support pagination in pipelines endpoint in API 2

Summary

Pagination is not working for pipelines endpoint in API 2

Steps to Reproduce

1. A repo with more than 10 Pipelines builds is needed to reproduce
2. Execute the following curl command:

#!curl

curl --request GET --user username:password https://api.bitbucket.org/2.0/repositories/<username>/<repo-slug>/pipelines/

Expected Results

The output returns a paginated collection with a "next" field, including the link to the next page

Actual Results

The "next" field is missing from the output.

Workaround

Add a query parameter of the page, e.g. if you want to access the 2nd page:

#!curl

curl --request GET --user username:password https://api.bitbucket.org/2.0/repositories/<username>/<repo-slug>/pipelines/?page=2