[frontend] Fix default confidence

[RomuDeuxfois]

Proposed changes

• Handle default confidence in context of container
• Handle default confidence, author and markins when missing :
• • create observable from container observables tab
• • create SDO from container entities tab
• • create Stix Object/relationship from container linked entities

Related issues

• Regression on default values when creating entities in the context of a container #3921

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...

[Archidoit]

working well :)