fix: create ds with same name in different ws and different task

[frascuchon]

After changes in #1572, creating a dataset with the same name as an already registered in Rubrix, in a different workspace, and with a different task, raise an error. This PR includes changes for that. It should be squashed together with #1572

[codecov]

Codecov Report

Merging #1608 (184c689) into releases/0.x (4f2c35c) will increase coverage by 0.01%.
The diff coverage is 50.00%.

@@               Coverage Diff                @@
##           releases/0.x    #1608      +/-   ##
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+ Coverage         95.31%   95.33%   +0.01%     
================================================
  Files               131      131              
  Lines              6426     6429       +3     
================================================
+ Hits               6125     6129       +4     
+ Misses              301      300       -1     

Flag	Coverage Δ
pytest	95.33% <50.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
src/rubrix/server/services/datasets.py	96.15% <50.00%> (-1.87%)	⬇️
...ubrix/labeling/text_classification/label_errors.py	90.36% <0.00%> (+3.61%)	⬆️

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