Fixes creating a KB from an Import

[carlesonielfa]

Description

Had some issues importing a KB from hosted to standalone, this fixes it.

Another approach might be to remove these fields at export time, but then that exported fields wouldn't match those defined here:

nucliadb/nucliadb/src/nucliadb/learning_proxy.py

Line 67 in f612bd3

class SemanticConfig(BaseModel):

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.53%. Comparing base (f612bd3) to head (c55416f).
⚠️ Report is 776 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2778      +/-   ##
==========================================
- Coverage   87.13%   82.53%   -4.60%     
==========================================
  Files         386      386              
  Lines       24293    24295       +2     
==========================================
- Hits        21167    20053    -1114     
- Misses       3126     4242    +1116     

Flag	Coverage Δ
nucliadb	65.31% <100.00%> (-9.46%)	⬇️
nucliadb-ingest	40.73% <0.00%> (-0.01%)	⬇️
nucliadb-reader	42.74% <0.00%> (-0.01%)	⬇️
nucliadb-search	43.58% <0.00%> (-0.01%)	⬇️
nucliadb-standalone	47.47% <100.00%> (+<0.01%)	⬆️
nucliadb-train	45.70% <0.00%> (-0.01%)	⬇️
nucliadb-writer	46.20% <100.00%> (+<0.01%)	⬆️
nucliadb_dataset	∅ <ø> (∅)
nucliadb_models	86.89% <ø> (ø)
nucliadb_sdk	86.70% <ø> (ø)
nucliadb_sidecar	∅ <ø> (∅)
nucliadb_telemetry	86.56% <ø> (ø)
nucliadb_utils	81.96% <ø> (ø)

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