Email notifications: the message 'and more commits' is missing when there is more than 5 commits for batched notifications

This is because the rescope processor caps the number of both the added and removed commits to 5.

As a result, PullRequestRescopeActivity.getAdded().getChangesets() and PullRequestRescopeActivity.getRemoved().getChangesets() will always return at most 5 changesets. (The counts PullRequestRescopeActivity.getAdded().getTotal() and PullRequestRescopeActivity.getRemoved().getTotal() are always correct though.)