Add EPSS conditions to policies

[2000rosser]

Description

This change will allow users to use EPSS scores in their policies.

Addressed Issue

closes #3703

Checklist

• [x] I have read and understand the contributing guidelines
• [ ] This PR fixes a defect, and I have provided tests to verify that the fix is effective
• [x] This PR implements an enhancement, and I have provided tests to verify that it works as intended
• [ ] This PR introduces changes to the database model, and I have added corresponding update logic
• [ ] This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00% (target: -1.00%)	:white_check_mark: 80.65% (target: 70.00%)

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (b188c7d919d7fc9568dde86d3e5a29a05ad6f66c) | 21640 | 16399 | 75.78% | | | Head commit (cc24d08e699f218d93cec7638a291f0cc7ff305e) | 21669 (+29) | 16422 (+23) | 75.79% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#3746) | 31 | 25 | **80.65%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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