IPV6 observables are not unique in the platform

[romain-filigran]

Description

IPV6 observables are not unique in the platform.

Environment

2. OpenCTI version: 6.2.0

Reproducible Steps

1. Create an IPV6 observable like: 2600:9000:244f:9600:9:a3db:e000:93a1 and validate
2. Create the same IPV6 observable

Expected Output

Only one observable in the platform

Actual Output

Duplicate observables