fix(#1527): check agents instead labels for predicted computation

[frascuchon]

Closes #1527

Review after #1530

[codecov]

Codecov Report

Merging #1528 (ccaa46d) into master (b1658da) will not change coverage.
The diff coverage is 100.00%.

❗ Current head ccaa46d differs from pull request most recent head ff387a1. Consider uploading reports for the commit ff387a1 to get more accurate results

@@           Coverage Diff           @@
##           master    #1528   +/-   ##
=======================================
  Coverage   95.40%   95.40%           
=======================================
  Files         131      131           
  Lines        6438     6438           
=======================================
  Hits         6142     6142           
  Misses        296      296           

Flag	Coverage Δ
pytest	95.40% <100.00%> (ø)

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Impacted Files	Coverage Δ
...rver/apis/v0/models/metrics/text_classification.py	100.00% <100.00%> (ø)
...ubrix/server/apis/v0/models/text_classification.py	99.41% <100.00%> (ø)

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[dcfidalgo]

💯