Don't try to send partial result / source playback for transcode API

[mjh1]

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[codecov]

Codecov Report

Merging #219 (326c828) into main (3e49990) will decrease coverage by 1.10984%.
Report is 1 commits behind head on main.
The diff coverage is 2.58065%.

@@                 Coverage Diff                 @@
##                main        #219         +/-   ##
===================================================
- Coverage   18.80531%   17.69547%   -1.10984%     
===================================================
  Files             16          16                 
  Lines           1808        1944        +136     
===================================================
+ Hits             340         344          +4     
- Misses          1443        1575        +132     
  Partials          25          25                 

Files	Coverage Δ
clients/catalyst.go	84.14634% <ø> (ø)
task/runner.go	22.19959% <ø> (ø)
task/upload.go	17.32283% <2.58065%> (-3.91965%)	⬇️

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Files	Coverage Δ
clients/catalyst.go	84.14634% <ø> (ø)
task/runner.go	22.19959% <ø> (ø)
task/upload.go	17.32283% <2.58065%> (-3.91965%)	⬇️