feat: FIT-974: [FSM API] Manual Transition Endpoint

[robot-ci-heartex]

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Please ensure that all linked upstream Pull Requests are merged before proceeding with this one.

• feat: FIT-974: [FSM API] Manual Transition Endpoint label-studio-sdk#677

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.97%. Comparing base (6492398) to head (d44288d).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #8856       +/-   ##
============================================
+ Coverage    37.90%   80.97%   +43.07%     
============================================
  Files          734      258      -476     
  Lines        57800    23517    -34283     
  Branches      9403        0     -9403     
============================================
- Hits         21908    19044     -2864     
+ Misses       35888     4473    -31415     
+ Partials         4        0        -4     

Flag	Coverage Δ
lsf-unit	?
pytests	80.97% <ø> (ø)

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