feat(#1192): disable ssl verify for elasticsearch http client

[frascuchon]

This PR just allows disable http ssl client verification (for elasticsearch/opensearch connection) by setting the environment variable:

RUBRIX_ELASTICSEARCH_SSL_VERIFY=False

This is strongly discouraged for production environments, but can be used for quick testing of non-secure environments.

[codecov]

Codecov Report

Merging #1193 (301d669) into master (1803531) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1193   +/-   ##
=======================================
  Coverage   94.99%   94.99%           
=======================================
  Files         124      124           
  Lines        4955     4956    +1     
=======================================
+ Hits         4707     4708    +1     
  Misses        248      248           

Flag	Coverage Δ
pytest	94.99% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
src/rubrix/server/commons/es_wrapper.py	88.46% <100.00%> (ø)
src/rubrix/server/commons/settings.py	88.88% <100.00%> (+0.25%)	⬆️

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