Gh-3326: Update Schema merge federated POC

[tb06904]

Updates how schemas are merged to make them more robust to failure. Includes some minor related tweaks too.

Related issue

• Resolve Update how schemas are merged Federated POC #3326

[codecov]

Codecov Report

Attention: Patch coverage is 91.17647% with 3 lines in your changes missing coverage. Please review.

Project coverage is 68.01%. Comparing base (3aae44d) to head (e8d9fd1).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
...mple/operation/handler/FederatedOutputHandler.java	33.33%	2 Missing ⚠️
...e/operation/handler/FederatedOperationHandler.java	66.66%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3328      +/-   ##
=============================================
+ Coverage      67.98%   68.01%   +0.02%     
  Complexity      2596     2596              
=============================================
  Files            955      955              
  Lines          30531    30564      +33     
  Branches        3371     3376       +5     
=============================================
+ Hits           20757    20787      +30     
- Misses          8299     8302       +3     
  Partials        1475     1475              

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[sonarqubecloud]

Quality Gate failed

Failed conditions
B Maintainability Rating on New Code (required ≥ A)

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