Index only upon processing message received

[lferran]

Description

We no longer need to index anything when ingesting writer messages, as the catalog is responsible for showing the title and the labels to the user after an upload/resource creation request is finished.

Also, when a kb is configured with an external index provider, we no longer need to index on our index either.

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 30.76923% with 9 lines in your changes missing coverage. Please review.

Project coverage is 86.48%. Comparing base (7ca8964) to head (415352c).

Files with missing lines	Patch %	Lines
...iadb/src/nucliadb/ingest/orm/processor/__init__.py	30.76%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2641      +/-   ##
==========================================
- Coverage   86.48%   86.48%   -0.01%     
==========================================
  Files         376      376              
  Lines       23587    23584       -3     
==========================================
- Hits        20400    20397       -3     
  Misses       3187     3187              

Flag	Coverage Δ
nucliadb-reader	24.07% <30.76%> (-0.48%)	⬇️
nucliadb-standalone	46.53% <30.76%> (-0.33%)	⬇️
nucliadb_models	84.85% <ø> (ø)
nucliadb_sidecar	89.03% <ø> (+1.78%)	⬆️
nucliadb_telemetry	86.55% <ø> (ø)
nucliadb_utils	84.31% <ø> (ø)

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