Re-use SE spec helper for WebIDE
What does this MR do and why?
Just a tiny re-factoring to re-use the Source Editor spec helper for WebIDE when setting/retrieving editor's value
Screenshots or screen recordings
No visual changes
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #345219 (closed)