[backend] Generate observables/indicators for all objects in bundle (#6266)

[SouadHadjiat]

Proposed changes

• return bundle after adding all objects to create (indicators or observables)

Related issues

• [Playbook] "Promote observable to indicator" component doesn't work #6266

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

Looks like the issue has always been present, not a regression of the last release.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 66.65%. Comparing base (eb9f8cc) to head (1ce0231).

Files	Patch %	Lines
...raphql/src/modules/playbook/playbook-components.ts	0.00%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6271      +/-   ##
==========================================
- Coverage   66.66%   66.65%   -0.01%     
==========================================
  Files         541      541              
  Lines       64426    64434       +8     
  Branches     5257     5256       -1     
==========================================
  Hits        42948    42948              
- Misses      21478    21486       +8     

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