TINY-8874: Dragging CEF element toward the edges doesn't cause scrolling when the edge of the editor is hidden

[hamza0867]

Related Ticket: TINY-8874

Description of Changes:

• Support cases when dragging a CEF element towards an edge of the screen when that edge of the editor is hidden

Pre-checks:

• [x] ~Changelog entry added~ (Done in #7998)
• [x] Tests have been added (if applicable)
• [x] Branch prefixed with feature/, hotfix/ or spike/

Review:

• [x] Milestone set
• [x] ~Docs ticket created (if applicable)~

GitHub issues (if applicable):