Articles "trash" feature

[caiosba]

Description

Allow articles (explainers and fact-checks) to be sent to / restored from the trash.

Steps:

• Add a trashed attribute to database, GraphQL type and GraphQL update mutation for explainers and fact-checks
• Add a trashed filter to articles queries, which is false by default
• When a fact-check is trashed, make sure it's detached and unpublished
• When an explainer is trashed, make sure that it's detached from all items
• Validate: Can't apply trashed article to item
• Delete article permanently automatically after 30 days in the trash (Sidekiq scheduled job) (for fact-checks, both the claim and the fact-check must be deleted)
• Add automated tests

Reference: CV2-5068.

How has this been tested?

Automated tests in order to keep 100% code coverage.

Checklist

• I have performed a self-review of my own code
• I have added unit and feature tests, if the PR implements a new feature or otherwise would benefit from additional testing
• I have added regression tests, if the PR fixes a bug
• I have added logging, exception reporting, and custom tracing with any additional information required for debugging
• I considered secure coding practices when writing this code. Any security concerns are noted above.
• I have commented my code in hard-to-understand areas, if any
• I have made needed changes to the README
• My changes generate no new warnings
• If I added a third party module, I included a rationale for doing so and followed our current guidelines

[melsawy]

Suggest to swap the lines as I prefer to destroy the object itself at the end.

[caiosba]

@melsawy good catch! I did that before but it had an issue because of the destroy dependency between claim and fact-check.

[melsawy]

Great work Dr Caio
just left a small comment and it's my prefer and you can ignore it