Review and extract duplicate code to its own modules

[juanjosevazquezgil]

Motivation

We currently have a bit of duplicated code across modules. For example, MergePullRequest() in both hydrate-orchestrator and update-claims-features. While this is not the biggest of problems, the sooner we review and refactor the code the easier it'll be to change.

Acceptance criteria

• The code has been reviewed
• Duplicated functions have been extracted to modules so they can be easily reused
• The new modules are used instead of the duplicated code we have now