Fix/add-semaphore-to-batch-poster

[btravisebsco]

Purpose

Fix edge case around upsert performance in some Eureka environments by adding a configurable semaphore to limit simultaneous requests.

Changes Made in this PR

Code Review Specifics

Task Checklist

• Ran nox -rs safety.
• Ran pre-commit run --all-files
• Tests cover new or modified code.
• Ran test suite: nox -rs tests
• Code runs and outputs default usage info: cd src; poetry run python3 -m folio_migration_tools -h
• Documentation updated

Warning Checklist

• New dependencies added
• Includes breaking changes

How to Verify

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 77.58%. Comparing base (7cb7853) to head (56d23f3).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...io_migration_tools/migration_tasks/batch_poster.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #985   +/-   ##
=======================================
  Coverage   77.58%   77.58%           
=======================================
  Files         107      107           
  Lines       14298    14304    +6     
  Branches     1759     1760    +1     
=======================================
+ Hits        11093    11098    +5     
- Misses       2868     2869    +1     
  Partials      337      337           

Flag	Coverage Δ
unittests	77.58% <85.71%> (+<0.01%)	⬆️

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