[CI] User reusable workflow for automated release

[PrimozGodec]

Description of changes

Since we now have a reusable workflow for release, I am replacing the current release workflow with a reusable one.

I am also:

• removing get_column workaround and finding Onrage versions
• adding sphinx_rtd_theme to doc requirements (which is necessary that documentation is built while release)
• making black happy :) for lint to pass

The release seems to work: https://github.com/biolab/orange3-survival-analysis/actions/runs/8345298306.

Includes

• Code changes
• Tests
• Documentation

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.37%. Comparing base (a084241) to head (6a03934).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
+ Coverage   67.18%   67.37%   +0.19%     
==========================================
  Files          17       16       -1     
  Lines        2261     2244      -17     
==========================================
- Hits         1519     1512       -7     
+ Misses        742      732      -10     

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