Modified API endpoint that RsyncInstance deletion requests are sent to

[tieneupin]

Passing paths in the URL to a FastAPI endpoint will cause leading '/' in Unix-style paths to be removed. Passing the path as a properly quoted/escaped query component in the URL will prevent this from occurring.

Also added a log to capture information about what source and session ID the request fails on.

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 30.22%. Comparing base (b88806d) to head (e368880).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #578      +/-   ##
==========================================
- Coverage   30.23%   30.22%   -0.01%     
==========================================
  Files          80       80              
  Lines       10499    10502       +3     
  Branches     1401     1401              
==========================================
  Hits         3174     3174              
- Misses       7220     7223       +3     
  Partials      105      105              

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