[client] background tasks fixes (opencti #10274)

[JeremyCloarec]

Proposed changes

• revert draft was missing for sightings & relationships
• share/unshare was missing for sightings & relationships

opencti PR OpenCTI-Platform/opencti#11308

Related issues

• opencti [client] background tasks to worker fixes (opencti #10274) #906

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

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...