fix(search): prevent exceed search.max buckets for metadata fields

[frascuchon]

After the changes included in #1396, we could find errors related to search.max_buckets configuration. This PR includes some checks and reactors to avoid that, especially for metadata fields.

[codecov]

Codecov Report

Merging #1401 (27b0402) into master (523ba44) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1401      +/-   ##
==========================================
+ Coverage   94.41%   94.43%   +0.01%     
==========================================
  Files         130      130              
  Lines        5877     5889      +12     
==========================================
+ Hits         5549     5561      +12     
  Misses        328      328              

Flag	Coverage Δ
pytest	94.43% <100.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
src/rubrix/server/commons/es_helpers.py	85.00% <100.00%> (+0.06%)	⬆️
.../rubrix/server/tasks/commons/metrics/model/base.py	94.50% <100.00%> (+0.06%)	⬆️
src/rubrix/server/tasks/commons/metrics/service.py	98.38% <100.00%> (+0.31%)	⬆️

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