fix(#1410): apply dataset name pattern to user name

[frascuchon]

Closes #1410

[codecov]

Codecov Report

Merging #1411 (0213569) into master (0448b33) will increase coverage by 0.09%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1411      +/-   ##
==========================================
+ Coverage   94.41%   94.50%   +0.09%     
==========================================
  Files         130      130              
  Lines        5889     5898       +9     
==========================================
+ Hits         5560     5574      +14     
+ Misses        329      324       -5     

Flag	Coverage Δ
pytest	94.50% <100.00%> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
src/rubrix/server/security/model.py	100.00% <100.00%> (ø)
src/rubrix/server/commons/es_wrapper.py	87.40% <0.00%> (-0.75%)	⬇️
src/rubrix/server/datasets/service.py	97.70% <0.00%> (ø)
src/rubrix/server/server.py	94.33% <0.00%> (+12.33%)	⬆️

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[frascuchon]

A custom validator with a custom error message is applied.

@dvsrepo take a look at the message, pls