Task submit/status error handling refactor

[knagaitsev]

This is a refactor draft for the submit and status routes as detailed here: #210

[codecov-io]

Codecov Report

Merging #211 (197e1fc) into main (b9fa973) will increase coverage by 0.83%.
The diff coverage is 76.81%.

@@            Coverage Diff             @@
##             main     #211      +/-   ##
==========================================
+ Coverage   57.97%   58.80%   +0.83%     
==========================================
  Files          22       22              
  Lines        1744     1755      +11     
==========================================
+ Hits         1011     1032      +21     
+ Misses        733      723      -10     

Impacted Files	Coverage Δ
funcx_web_service/error_responses.py	100.00% <ø> (ø)
funcx_web_service/routes/automate.py	18.57% <ø> (ø)
funcx_web_service/routes/funcx.py	41.16% <58.97%> (+2.20%)	⬆️
tests/routes/test_funcx.py	100.00% <100.00%> (ø)

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