Added the GLSegmentedControl for Rich/Source buttons

Merged Shamvi05 requested to merge shamvi050801/gitlab:gl-segmented-control-rich-source into master

What does this MR do and why?

Replaced the GLButtons of Rich Text /Source with GL Segmented Control as required for the issue #356436 (closed)

Screenshots or screen recordings

Demonstration

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.