Allow reprocessing of files for SXT

[stephen-riggs]

Do not skip processing for SXT files which were already processed, as they may have a new reference attached.

This will trigger reprocessing on session reconnection, which isn't ideal but is probably ok for now

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.99%. Comparing base (9f34b0a) to head (ec905b1).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #851      +/-   ##
==========================================
- Coverage   54.55%   53.99%   -0.56%     
==========================================
  Files         104      104              
  Lines       11087    11341     +254     
  Branches     1472     1524      +52     
==========================================
+ Hits         6048     6124      +76     
- Misses       4718     4892     +174     
- Partials      321      325       +4     

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