According to Atlassian's Bitbucket team we are using some inefficient API methods that cause undue load on their API endpoints.

BitbucketCloudApiClient uses a mixture of v1 and v2 APIs. We should switch solely over to Bitbucket v2 API to avoid load issues for Bitbucket and prevent a nasty surprise when they finally deprecate v1.

We need to ensure that pagination is also handled.