Delete vectors on label change

[javitonino]

Description

Describe the proposed changes made in this PR.

How was this PR tested?

Describe how you tested this PR.

[github-actions]

Benchmark

Benchmark suite	Current: 754be1a	Previous: 08db1e8	Ratio
nucliadb/search/tests/unit/search/test_fetch.py::test_highligh_error	3024.5924667866993 iter/sec (stddev: 0.000002289492274452081)	3041.132211072051 iter/sec (stddev: 0.0000011628635974660105)	1.01

This comment was automatically generated by workflow using github-action-benchmark.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.18%. Comparing base (b551226) to head (4f36765).

❗ Current head 4f36765 differs from pull request most recent head 754be1a

Please upload reports for the commit 754be1a to get more accurate results.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2211      +/-   ##
==========================================
+ Coverage   77.15%   85.18%   +8.03%     
==========================================
  Files          94        4      -90     
  Lines        6045      162    -5883     
==========================================
- Hits         4664      138    -4526     
+ Misses       1381       24    -1357     

Flag	Coverage Δ
ingest	?
node-sidecar	?
sdk	85.18% <ø> (-0.70%)	⬇️
utils	?

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