fix: verify_config now checks processors in child process groups

[Chaffelson]

Previously verify_config filtered processors to only those directly in the root process group, missing processors in child PGs. This caused issues with connectors that have nested process group structures.

Also adds --only_failures option to reduce output size for large flows.

[Copilot]

Pull request overview

This PR fixes a bug where verify_config only checked processors in the root process group and adds a new feature to filter results to show only failures.

Changes:

• Modified _verify_processors to verify processors in all descendant process groups, not just the root PG
• Added only_failures parameter to optionally filter results to show only failed components
• Refactored result building to use a consolidated all_results variable for cleaner code

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[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.58%. Comparing base (a8b7f19) to head (5152585).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
nipyapi/ci/verify_config.py	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #404      +/-   ##
==========================================
- Coverage   76.65%   76.58%   -0.07%     
==========================================
  Files          41       41              
  Lines        4780     4780              
==========================================
- Hits         3664     3661       -3     
- Misses       1116     1119       +3     

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