Catching MultipleObjectsReturned, logging that only a single map is supported

[aaronchongth]

Self-checks

• I have prototyped this new feature (if necessary) on Figma
• 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

Merging #730 (616b54c) into main (22355c1) will decrease coverage by 0.03%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##             main     #730      +/-   ##
==========================================
- Coverage   54.68%   54.66%   -0.03%     
==========================================
  Files         261      261              
  Lines        6473     6480       +7     
  Branches      836      836              
==========================================
+ Hits         3540     3542       +2     
- Misses       2795     2800       +5     
  Partials      138      138              

Flag	Coverage Δ
api-server	82.59% <37.50%> (-0.14%)	⬇️

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Files Changed	Coverage Δ
...es/api-server/api_server/rmf_io/health_watchdog.py	77.10% <37.50%> (-2.14%)	⬇️

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[akash-roboticist]

Thanks for adding this Aaron, this is really helpful!!

[akash-roboticist]

LGTM