Remove attention request related API references and quick actions
What does this MR do and why?
Removing attention request related API references and quick actions as we no longer releasing attention request feature.
Related to #366442 (closed)
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 #366442 (closed)
Edited by Sincheol (David) Kim