Deletes all existing building map entries if the id does not match the current served map, before saving

[aaronchongth]

What's new

Ensures that the map saved in db is always the one that is currently being served by the building map server.

This can be tested by starting an api-server instance, and changing the building map server,

# start api-server in a terminal
pnpm start

# serve office map, Ctrl+C, serve airport terminal map, repeat
ros2 run rmf_building_map_tools building_map_server WORKSPACE_DIR/install/rmf_demos_maps/share/rmf_demos_maps/office/office.building.yaml
ros2 run rmf_building_map_tools building_map_server WORKSPACE_DIR/install/rmf_demos_maps/share/rmf_demos_maps/airport_terminal/airport_terminal.building.yaml

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 #735 (9066957) into main (5fcccd3) will increase coverage by 0.01%.
The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main     #735      +/-   ##
==========================================
+ Coverage   54.64%   54.65%   +0.01%     
==========================================
  Files         263      263              
  Lines        6524     6528       +4     
  Branches      862      862              
==========================================
+ Hits         3565     3568       +3     
- Misses       2819     2820       +1     
  Partials      140      140              

Flag	Coverage Δ
api-server	82.58% <75.00%> (-0.02%)	⬇️

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Files Changed	Coverage Δ
...kages/api-server/api_server/models/building_map.py	88.88% <75.00%> (-3.97%)	⬇️

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[akash-roboticist]

Since other data is not affected in the db, I think this looks fine and will minimize issues due to map updates during commissioning phase.
Thanks Aaron!