DEV-2671: Simplify and fix rotation calculations

[robot-ci-heartex]

Hi @hlomzik!

This PR was created in response to a PRs in upstream repo:

• https://github.com/heartexlabs/label-studio-frontend/pull/768

[swarmia[bot]]

✅  Linked to Story DEV-2671 · Anchor of bboxes around image boundaries
➡️  Part of Epic DEV-2132 · Bounding box annotation UX improvements

[hlomzik]

/git merge develop

Error: Merge conflict detected, please resolve it using the command line.

Workflow run

[hlomzik]

merged already a time ago