add-to-project workflow: automatically add reviewers without need of CODEOWNERS

[chicco785]

Description

automatically add reviewers without need of CODEOWNERS, reviewers are added if and only if the PR is not in draft mode.

The recommendation is to start the PR in draft mode, and move it to ready only when actually ready for review.

While CODEOWNERS is very powerful, it would require to add such file to all repositories.

Changes Made

• add specified team as collaborator (default team is backend-devs)
• add rowi1de/auto-assign-review-teams@v1.1.3 to add-to-project workflow

Related Issues

Fixes #38

Checklist

• I have used a PR title that is descriptive enough for a release note.
• I have tested these changes locally.
• I have added appropriate tests or updated existing tests.
• I have tested these changes on a dedicated VM or a customer VM [name of the VM]
• I have added appropriate documentation or updated existing documentation.