refactor: remove the classification labeling rules service

[frascuchon]

Description

This PR move the labeling rule operations from the labeling rule service to the text-classfication service.

Type of change

(Please delete options that are not relevant. Remember to title the PR according to the type of change)

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactor (change restructuring the codebase without changing functionality)
• Improvement (change adding some improvement to an existing functionality)
• Documentation update

Checklist

• I have merged the original branch into my forked branch
• I added relevant documentation
• follows the style guidelines of this project
• I did a self-review of my code
• I added comments to my code
• I made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works

[codecov]

Codecov Report

Base: 91.86% // Head: 91.85% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (faa225b) compared to base (4c5f513).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2361      +/-   ##
===========================================
- Coverage    91.86%   91.85%   -0.01%     
===========================================
  Files          161      160       -1     
  Lines         7869     7849      -20     
===========================================
- Hits          7229     7210      -19     
+ Misses         640      639       -1     

Flag	Coverage Δ
pytest	91.85% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ver/services/tasks/text_classification/__init__.py	100.00% <ø> (ø)
...rver/services/tasks/text_classification/metrics.py	98.33% <ø> (ø)
src/argilla/server/apis/v0/handlers/metrics.py	97.50% <100.00%> (+0.27%)	⬆️
...lla/server/apis/v0/handlers/text_classification.py	86.53% <100.00%> (ø)
src/argilla/server/daos/backend/metrics/base.py	100.00% <100.00%> (ø)
...server/daos/backend/metrics/text_classification.py	98.18% <100.00%> (ø)
src/argilla/server/services/datasets.py	97.27% <100.00%> (+0.05%)	⬆️
src/argilla/server/services/metrics/service.py	100.00% <100.00%> (ø)
...server/services/tasks/text_classification/model.py	99.35% <100.00%> (+0.04%)	⬆️
...rver/services/tasks/text_classification/service.py	96.46% <100.00%> (+0.90%)	⬆️
... and 2 more

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