WIP: convert search http exceptions to returns

[vangheem]

Description

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How was this PR tested?

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[codecov]

Codecov Report

Patch coverage: 67.30% and project coverage change: -0.18 ⚠️

Comparison is base (865be1f) 82.20% compared to head (6739e06) 82.02%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #736      +/-   ##
==========================================
- Coverage   82.20%   82.02%   -0.18%     
==========================================
  Files         263      264       +1     
  Lines       15602    15656      +54     
==========================================
+ Hits        12825    12842      +17     
- Misses       2777     2814      +37     

Flag	Coverage Δ
client	71.16% <ø> (ø)
ingest	64.41% <ø> (+0.06%)	⬆️
nucliadb	61.43% <67.30%> (-0.18%)	⬇️
reader	73.76% <ø> (ø)
sdk	70.04% <ø> (ø)
train	57.56% <ø> (ø)
utils	86.34% <ø> (ø)
writer	85.41% <ø> (-1.11%)	⬇️

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

Impacted Files	Coverage Δ
nucliadb/nucliadb/search/api/v1/knowledgebox.py	73.46% <40.00%> (-2.07%)	⬇️
nucliadb/nucliadb/search/api/v1/chat.py	39.62% <50.00%> (-0.38%)	⬇️
nucliadb/nucliadb/search/api/v1/find.py	76.36% <50.00%> (-5.64%)	⬇️
nucliadb/nucliadb/search/api/v1/search.py	91.04% <69.23%> (-5.39%)	⬇️
nucliadb/nucliadb/search/api/v1/resource.py	93.33% <75.00%> (-3.22%)	⬇️
nucliadb/nucliadb/models/responses.py	100.00% <100.00%> (+13.33%)	⬆️
nucliadb/nucliadb/search/api/v1/exceptions.py	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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[vangheem]

closing as not important right now and there's already been work done here.