Cap max number of relations returned

[lferran]

Description

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How was this PR tested?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.59%. Comparing base (c1b5b9c) to head (3743ab7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2403      +/-   ##
==========================================
+ Coverage   86.56%   86.59%   +0.02%     
==========================================
  Files         373      373              
  Lines       23077    23066      -11     
==========================================
- Hits        19976    19973       -3     
+ Misses       3101     3093       -8     

Flag	Coverage Δ
nucliadb	73.64% <100.00%> (+0.08%)	⬆️
nucliadb-ingest	29.54% <0.00%> (+0.02%)	⬆️
nucliadb-reader	25.29% <0.00%> (+0.01%)	⬆️
nucliadb-search	37.26% <100.00%> (-0.02%)	⬇️
nucliadb-standalone	47.50% <0.00%> (+0.02%)	⬆️
nucliadb-train	46.43% <0.00%> (+0.02%)	⬆️
nucliadb-writer	40.44% <0.00%> (+0.02%)	⬆️
nucliadb_dataset	60.09% <ø> (ø)
nucliadb_models	85.11% <ø> (ø)
nucliadb_sdk	77.48% <ø> (ø)
nucliadb_sidecar	92.75% <ø> (-1.70%)	⬇️
nucliadb_telemetry	86.55% <ø> (ø)
nucliadb_utils	83.34% <ø> (ø)

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