[Backend]: Linked PRs are not tracked by the workflow

[thedocruby]

Prerequisites

• I have read the Git Etiquette. (Required)
• I agree to follow the Code of Conduct. (Required)

Summary (Required)

Linked PRs are not tracked by the workflow. This causes gaps in automation between the Backlog 📜 and In Progress 🛠️ statuses. In these cases, In Progress 🛠️ must be added manually when the PR is linked.

In addition, All PR's should be linked, even though outside contributors have no means to do this.

Potential Solution (Required)

Add a workflow job for the connected Issue event type that changes the labels and status of the issue to In Progress 🛠️.

In addition, add an Unlinked ⛓️ Flag label that is added to new Pull Requests, so that contributors and organization members can address these as soon as possible.

It would also be a good idea to explore keyword linking.

In which category does the issue belong? (Required)

Meta 👨‍💻 - Changes development files, but not product code (e.g. changes to .gitignore, workflows, readme...).