Fixes an issue with repeated transfers requested upon completion of staging.

[jeff-cohere]

This pair of changes prevent us from requesting file moves more than once after files are staged. It seems to fix an issue observed by Sophie in her custom CSU transfers.

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.03%. Comparing base (0812bc0) to head (6afb8ee).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
transfers/mover.go	71.42%	2 Missing ⚠️
transfers/stager.go	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #195      +/-   ##
==========================================
- Coverage   65.08%   65.03%   -0.05%     
==========================================
  Files          34       34              
  Lines        4459     4462       +3     
==========================================
  Hits         2902     2902              
- Misses       1236     1239       +3     
  Partials      321      321              

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[jeff-cohere]

The only remaining test failures are related to a Globus endpoint we don't control, so I'm merging this.