Deferred resource to shard assignation

[lferran]

Description

Describe the proposed changes made in this PR.

How was this PR tested?

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[codecov]

Codecov Report

Attention: Patch coverage is 35.29412% with 11 lines in your changes missing coverage. Please review.

Project coverage is 86.49%. Comparing base (12db918) to head (fcad257).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...iadb/src/nucliadb/ingest/orm/processor/__init__.py	35.29%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2640      +/-   ##
==========================================
- Coverage   86.52%   86.49%   -0.04%     
==========================================
  Files         376      376              
  Lines       23602    23607       +5     
==========================================
- Hits        20422    20418       -4     
- Misses       3180     3189       +9     

Flag	Coverage Δ
nucliadb-reader	24.07% <35.29%> (-0.48%)	⬇️
nucliadb-standalone	46.51% <35.29%> (-0.34%)	⬇️
nucliadb_models	84.85% <ø> (ø)
nucliadb_sidecar	87.24% <ø> (ø)
nucliadb_telemetry	86.55% <ø> (ø)
nucliadb_utils	84.31% <ø> (ø)

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