Add agents to Scan Execution Policies documentation
What does this MR do and why?
This MR updates documentation for Scan Execution Policies to add support for agents
keyword.
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 #341358 (closed)