GH-45316: [Release][C#] Use GitHub Releases for artifacts

[kou]

Rationale for this change

We don't need to use Artifactory for NuGet packages because it's not published to Artifactory.

What changes are included in this PR?

• Use GitHub Releases for easy to maintain
• Use .github/workflows/csharp.yml instead of nightly job for easy to maintain

Are these changes tested?

Almost yes.

Are there any user-facing changes?

No.

• GitHub Issue: [Release][C#] Use GitHub Releases for artifacts #45316

[github-actions]

⚠️ GitHub issue #45316 has been automatically assigned in GitHub to PR creator.

[raulcd]

Thanks @kou for taking this effort. I've gone through all these changes and everything looks pretty good to me.
I had some minor questions but have been solved once I've gone through the whole changeset, so from my side this can be merged and tried.
The uploaded contents looks good:

Archive:  nuget.zip
  inflating: Apache.Arrow.20.0.0-dev-10.nupkg  
  inflating: Apache.Arrow.20.0.0-dev-10.nupkg.sha256  
  inflating: Apache.Arrow.20.0.0-dev-10.nupkg.sha512  
  inflating: Apache.Arrow.20.0.0-dev-10.snupkg  
  inflating: Apache.Arrow.20.0.0-dev-10.snupkg.sha256  
  inflating: Apache.Arrow.20.0.0-dev-10.snupkg.sha512  
  inflating: Apache.Arrow.Compression.20.0.0-dev-10.nupkg  
  inflating: Apache.Arrow.Compression.20.0.0-dev-10.nupkg.sha256  
  inflating: Apache.Arrow.Compression.20.0.0-dev-10.nupkg.sha512  
  inflating: Apache.Arrow.Compression.20.0.0-dev-10.snupkg  
  inflating: Apache.Arrow.Compression.20.0.0-dev-10.snupkg.sha256  
  inflating: Apache.Arrow.Compression.20.0.0-dev-10.snupkg.sha512  
  inflating: Apache.Arrow.Flight.20.0.0-dev-10.nupkg  
  inflating: Apache.Arrow.Flight.20.0.0-dev-10.nupkg.sha256  
  inflating: Apache.Arrow.Flight.20.0.0-dev-10.nupkg.sha512  
  inflating: Apache.Arrow.Flight.20.0.0-dev-10.snupkg  
  inflating: Apache.Arrow.Flight.20.0.0-dev-10.snupkg.sha256  
  inflating: Apache.Arrow.Flight.20.0.0-dev-10.snupkg.sha512  
  inflating: Apache.Arrow.Flight.AspNetCore.20.0.0-dev-10.nupkg  
  inflating: Apache.Arrow.Flight.AspNetCore.20.0.0-dev-10.nupkg.sha256  
  inflating: Apache.Arrow.Flight.AspNetCore.20.0.0-dev-10.nupkg.sha512  
  inflating: Apache.Arrow.Flight.AspNetCore.20.0.0-dev-10.snupkg  
  inflating: Apache.Arrow.Flight.AspNetCore.20.0.0-dev-10.snupkg.sha256  
  inflating: Apache.Arrow.Flight.AspNetCore.20.0.0-dev-10.snupkg.sha512  
  inflating: Apache.Arrow.Flight.Sql.20.0.0-dev-10.nupkg  
  inflating: Apache.Arrow.Flight.Sql.20.0.0-dev-10.nupkg.sha256  
  inflating: Apache.Arrow.Flight.Sql.20.0.0-dev-10.nupkg.sha512  
  inflating: Apache.Arrow.Flight.Sql.20.0.0-dev-10.snupkg  
  inflating: Apache.Arrow.Flight.Sql.20.0.0-dev-10.snupkg.sha256  
  inflating: Apache.Arrow.Flight.Sql.20.0.0-dev-10.snupkg.sha512 

And the release changes to take those into account look also good.
I've also validated that the verify release script does not require changes (it will verify checksums correctly with the current changes).

[kou]

I'm checking tagging cases in my fork...: https://github.com/kou/arrow/releases/tag/apache-arrow-20.0.0-rc0

gh release upload is failing...: https://github.com/kou/arrow/actions/runs/12882744065/job/35921998748#step:11:18

[kou]

I confirmed that the followings work well:

• RC tag: https://github.com/kou/arrow/releases/tag/apache-arrow-20.0.0-rc0
  • GitHub Actions uploads .tar.gz and NuGet packages with .sha256/.sha512
  • dev/release/02-source.sh uploads .asc to GitHub Releases
• Release tag: https://github.com/kou/arrow/releases/tag/apache-arrow-20.0.0
  • GitHub Actions copies artifacts from GitHub Releases RC (.asc isn't copied because I pushed a release tag before dev/release/02-source.sh)
  • dev/release/post-08-csharp.sh downloads from GitHub Releases
  • NuGet packaging job skipped: https://github.com/kou/arrow/actions/runs/12885481674/job/35924035438

[kou]

I'll merge this in a few days if nobody objects this.

[assignUser]

gh release upload is failing...: https://github.com/kou/arrow/actions/runs/12882744065/job/35921998748#step:11:18

The GITHUB_TOKEN needs the contents: write permission to upload releases.

[kou]

gh release upload is failing...: https://github.com/kou/arrow/actions/runs/12882744065/job/35921998748#step:11:18

The GITHUB_TOKEN needs the contents: write permission to upload releases.

Right. I've fixed this by it.