[core] fix: explictly return results for RestApiClient

[AndreyMarkinPPC]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.31%. Comparing base (af99b02) to head (cc38bcd).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
libs/core/garf_core/api_clients.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
- Coverage   87.50%   87.31%   -0.20%     
==========================================
  Files          57       57              
  Lines        2625     2648      +23     
==========================================
+ Hits         2297     2312      +15     
- Misses        328      336       +8     

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