Release 1.2.1 (760)

[HonzaR]

This is a brief checklist to ensure all the necessary pre-release tasks have been done:

• [x] Update CHANGELOG.md
• [x] Update docs/whatsNew/WHATS_NEW_EN.md
• [x] Update version name (if required)
• [ ] Update release priority (if required)
• [x] Tag commit (after the connected PR is merged)