[SELC-8192] feat: refactor logic for onboarding aggregate

[gianmarcoplutino]

List of Changes

• refactor logic for onboarding aggregate

Motivation and Context

When onboarding aggregators with many aggregates, the system was spawning too many parallel sub-orchestrators simultaneously. This caused a TooManyRequest error for the DB.
The new batch orchestrator processes aggregates in controlled batches (default 5 at a time) with configurable delays between batches, preventing service overload and improving reliability.

How Has This Been Tested?

the function that invokes the new logic with a set of 100 aggregates has been triggered, the result did not highlight any DB overloads

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
88.2% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud