Error incorrect filter keys not existing in any schema definition when running background task with specific filters

[SouadHadjiat]

Description

When creating a background task with some specific filters (reproduced with source entity on relationships), I have this error :
incorrect filter keys not existing in any schema definition

Environment

1. OS (where OpenCTI server runs): { e.g. Mac OS 10, Windows 10, Ubuntu 16.4, etc. }
2. OpenCTI version: 5.12.14
3. OpenCTI client: frontend
4. Other environment details:

Reproducible Steps

I reproduced locally with "source entity" filter, but I suspect if can be reproduced with other filters (target entity, source and target types)

1. Go to Data -> Relationships
2. Filter by source entity
3. Try to create a background task (remove or add a label for example) => it fails with the above error

Additional information

I suspect buildQueryFiltersContent function which doesn't test correctly "key" (it's an array, not a string)