Fix/unimplemented endpoint

[aaronchongth]

What's new

Fixes #1064, by

• removing unimplemented endpoint, based on https://github.com/open-rmf/rmf_ros2/blob/main/rmf_fleet_adapter/src/rmf_fleet_adapter/TaskManager.cpp#L2706-L2764
• update api-client

Self-checks

• I'm familiar with and follow this Typescript guideline
• I added unit-tests for new components
• I tried testing edge cases
• I tested the behavior of the components that interact with the backend, with an e2e test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.15%. Comparing base (22fc6c2) to head (1c0af6a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1067      +/-   ##
==========================================
+ Coverage   70.00%   70.15%   +0.14%     
==========================================
  Files         288      288              
  Lines       14173    14197      +24     
  Branches     1137     1136       -1     
==========================================
+ Hits         9922     9960      +38     
+ Misses       4227     4213      -14     
  Partials       24       24              

Flag	Coverage Δ
api-server	80.01% <ø> (+0.61%)	⬆️
rmf-dashboard-framework	67.41% <ø> (ø)

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