[client] Add EPSS Support for Vulnerability Entity (#3568)

[ValentinBouzinFiligran]

Proposed changes

• epss score and epss percentile keys added on creation mutation and vulnerability query

Related issues

• Add EPSS Support for Vulnerability Entity opencti#3568

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

• [frontend/backend] Add EPSS Support for Vulnerability Entity (#3568) opencti#7802

[Archidoit]

Behavior and code OK 👍 but tests not passing