Extend deprecated properties with custom scan action
What does this MR do and why?
This change adds custom_scan deprecated property for scan execution policies and exposes deprecated_properties for ScanExecutionPolicy GraphQL type.
Frontend will be extended in a follow-up !162027 (merged) to show a banner based on this property if there's any scan execution policy using a custom scan action..
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Related to #477730 (closed)
Edited by Martin Cavoj