[backend] Pass markings to API (#issue/5797)

[Goumies]

Proposed changes

• Pass markings through export report pdf

Related issues

• https://github.com/OpenCTI-Platform/opencti/issues/5797

Checklist

• [ ] I consider the submitted work as finished
• [ ] I tested the code for its functionality using different use cases
• [ ] I added/update the relevant documentation (either on github or on notion)
• [ ] Where necessary I refactored code to improve the overall quality

Further comments

This pull request is related to the ones in the Client-Python and Open-CTI :

• https://github.com/OpenCTI-Platform/client-python/pull/561
• https://github.com/OpenCTI-Platform/opencti/pull/6030