Remove the client-side stashing for tomography

[stephen-riggs]

The client still stores a stash of data collection and processing job calls for tomography before the first mdoc is seen.
However, the server already has a preprocess stash for tomography, so the client one is not needed any more.

This removes the client stash, and just sends all requests on to the server.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 27.40%. Comparing base (51fd6ad) to head (40ddb49).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #473      +/-   ##
==========================================
+ Coverage   27.31%   27.40%   +0.08%     
==========================================
  Files          78       78              
  Lines       10159    10126      -33     
  Branches     1338     1333       -5     
==========================================
  Hits         2775     2775              
+ Misses       7288     7256      -32     
+ Partials       96       95       -1