Continuing adding deployable label

To roll back this change, revert the merge with `git revert -m 1 MERGE_SHA` and perform another deploy.

URLs
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QA Plan
-------
Check tests to make sure they cover well and finish successfully 

Lets to a minor switch here:

```ruby
built_labels = build_label_array(labels)
GitHub.add_labels_to_pull(config.github_repo, pull_number, get_names(built_labels) )
```