[Frontend]: Add EPSS filter to a policy editor

Why are we doing this work

See parent epic for more details

Relevant links

  1. Design #556415[EPSS_operand_dropdown.png]

Non-functional requirements

  • Documentation:
  • Feature flag: security_policies_kev_filtering
  • Performance:
  • Testing: Unit tests

Implementation plan

  1. Add new filter component to ee/app/assets/javascripts/security_orchestration/components/policy_editor/scan_result/rule/scan_filters
  2. Connect new component to ee/app/assets/javascripts/security_orchestration/components/policy_editor/scan_result/rule/security_scan_rule_builder.vue
  3. Make sure it is behind feature flag
  4. Add tests

Verirification steps

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