refactor(app): only show ODD runs loading screen when server returns 503

[shlokamin]

Overview

We currently show a loading screen on the ODD when the runs endpoint returns any error. We specifically want to only show the loading screen when the endpoint returns a 503.

Partially addresses https://opentrons.atlassian.net/browse/RQA-1872

Risk assessment

Low

[codecov]

Codecov Report

Merging #13940 (623a304) into edge (d826bfb) will increase coverage by 0.00%.
The diff coverage is 75.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             edge   #13940   +/-   ##
=======================================
  Coverage   70.66%   70.66%           
=======================================
  Files        2508     2508           
  Lines       70726    70728    +2     
  Branches     8681     8681           
=======================================
+ Hits        49977    49979    +2     
  Misses      18626    18626           
  Partials     2123     2123           

Flag	Coverage Δ
app	68.08% <0.00%> (ø)
react-api-client	65.96% <100.00%> (+0.14%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
react-api-client/src/runs/useAllRunsQuery.ts	91.66% <100.00%> (+1.66%)	⬆️
...src/pages/OnDeviceDisplay/RobotDashboard/index.tsx	68.42% <0.00%> (ø)