feat(opensearch): fetch logs from opensearch (#602)

[jlemesh]

Optionally fetch live workflow and job logs from OpenSearch.

OpenSearch client is configurable via env variables, passed by Helm chart. Defaults are defined in config.py file.

Read the Docs CI builds started to fail, added fix from https://about.readthedocs.com/blog/2024/07/addons-by-default/ in a separate commit.

Related to reanahub/reana#827.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.75%. Comparing base (e36c6a2) to head (46ae9cd).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #602      +/-   ##
==========================================
+ Coverage   75.59%   76.75%   +1.16%     
==========================================
  Files          15       16       +1     
  Lines        1565     1626      +61     
==========================================
+ Hits         1183     1248      +65     
+ Misses        382      378       -4     

Files with missing lines	Coverage Δ
reana_workflow_controller/config.py	92.37% <100.00%> (+1.19%)	⬆️
reana_workflow_controller/opensearch.py	100.00% <100.00%> (ø)
reana_workflow_controller/rest/utils.py	82.40% <100.00%> (+1.33%)	⬆️
reana_workflow_controller/rest/workflows_status.py	83.72% <100.00%> (+0.79%)	⬆️

[jlemesh]

Read the Docs build fails with:

      /usr/bin/ld: cannot find core/dot_h.o: No such file or directory
      collect2: error: ld returned 1 exit status

[tiborsimko]

Works nicely 👍

I've generated new docs/openapi.json, fixed the unit tests due to the presence of new live_logs_enabled property, and slightly amended the commit message.