Capture ResourcePath transfer_from exception in copy_files_for_distribution

[zhaoyuyoung]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.77%. Comparing base (01a8ea7) to head (3e517ff).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
python/lsst/ctrl/bps/panda/utils.py	42.85%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   34.88%   36.77%   +1.89%     
==========================================
  Files          13       13              
  Lines        1313     1327      +14     
  Branches      214      215       +1     
==========================================
+ Hits          458      488      +30     
+ Misses        835      817      -18     
- Partials       20       22       +2     

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[timj]

I think this code is more complicated than it needs to be. If trgt and src are ResourcePath objects then ResourcePath.mtransfer can do all of this itself so you can delete most of this code.

[zhaoyuyoung]

I'll check ResourcePath.mtransfer. This is a piece of legacy codes that started with IDF, so I guess it exists for a reason.

At the same time, I've found the reason why w_2026_12 failed to copy the quantum graph with the wrong protocol http:/ at RAL. It turns out the uri is treated as a local file other than the WebDAV one. So it's not a silent failure, but a successful transfer_from to the wrong destination.

[timj]

It existed before ResourcePath.mtransfer was written and which does exactly what this legacy code does.

[zhaoyuyoung]

Thanks for showing me this very useful tool. I've changed to use ResourcePath.mtransfer and the exception it catches. Will ask for a review next week.