Synchronise calls between PAC and Publishing

[angelraynovft]

Description

This PR intends to sync the draft annotations with the Publishing cluster regarding write operations. This solution is temporary until we decommission the PAC cluster.

What

For this goal, I created a small API with a function that gets the incoming write requests and before processing it we are duplicating it and sending it to the publishing cluster. Currently, we are redirecting the calls to publishing-dev-eu.

Why

https://financialtimes.atlassian.net/browse/UPPSF-5389

Anything, in particular, you'd like to highlight to reviewers

Mention here sections of code which you would like reviewers to pay extra attention to .E.g

Would appreciate a second pair of eyes on the test
I am not quite sure how this bit works
Is there a better library for doing x

Scope and particulars of this PR (Please tick all that apply)

• Tech hygiene (dependency updating & other tech debt)
• Bug fix
• Feature
• Documentation
• Breaking change
• Minor change (e.g. fixing a typo, adding config)

DoD - Ensure all relevant tasks are completed before marking this PR as "Ready for review"

• Test coverage is not significantly decreased
• All PR checks have passed
• Changes are deployed on dev before asking for review
• Documentations remains up-to-date
  • OpenAPI definition file is updated
  • README file is updated
  • Documentation is updated in upp-docs and upp-public-docs
  • Architecture diagrams are updated

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This Pull Request follows the rules described in our Pull Requests Guide

[coveralls]

coverage: 72.844% (-18.6%) from 91.426%
when pulling b24e767 on UPPSF-5389-sync-annotations-pac-and-publish
into 7eefaf3 on master.