[WIP] Setup package publishing via PyPi Trusted Publisher Management

[justusschock]

What does this PR do?

• Removes publishing to test.pypi.org for now
• Removes old publish action (not necessary)
• Uses plain pypi publishing based on Trusted Publisher Management setup in pypi (using oidc under the hood).
• Nightly packages will be uploaded to GH, but no longer to PyPi

Before submitting

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• Did you list all the breaking changes introduced by this pull request?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

PR review

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Reviewer checklist

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[github-actions]

⚡ Required checks status: All passing 🟢

No groups match the files changed in this PR.

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Thank you for your contribution! 💜

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