Fix errors in release workflow

[tr4nt0r]

This will hopefully fix the release workflow.

steps.check_prerelease.outputs.prerelease evaluates as string, that's why a release withg generated notes was published instead of using the draft created by release-drafter. Now it should only run this action for prereleases.

The artifacts upload should now also target the correct draft

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.17%. Comparing base (2e9c3e3) to head (44646ea).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #170   +/-   ##
=======================================
  Coverage   92.17%   92.17%           
=======================================
  Files           6        6           
  Lines         703      703           
  Branches       31       31           
=======================================
  Hits          648      648           
  Misses         47       47           
  Partials        8        8           

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