build: Don't create a changelog.

[feanil]

Pushing the changelog back up is not possible because all commits need
to be CLA checked and there's no way to do that with PSR at the moment.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.23%. Comparing base (bed319c) to head (3111917).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   88.23%   88.23%           
=======================================
  Files          13       13           
  Lines         408      408           
  Branches       16       16           
=======================================
  Hits          360      360           
  Misses         40       40           
  Partials        8        8           

Flag	Coverage Δ
unittests	88.23% <ø> (ø)

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[Copilot]

Pull request overview

This PR disables changelog generation in the semantic release workflow to avoid CLA check issues when pushing the changelog back to the repository.

• Removes changelog configuration from backend/pyproject.toml
• Adds changelog: "false" parameter to the semantic release workflow

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
backend/pyproject.toml	Removes the semantic_release changelog configuration that specified the changelog file location
.github/workflows/release.yml	Adds the changelog parameter set to false to disable changelog generation in the release workflow

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