.NET/CI: Improve testing, also against pre-release versions of Npgsql

[amotl]

About

Improve integration testing with Npgsql.

Details

With the drawback of introducing redundancies by retiring the use of the universal test runner ngr in this case, the CI workflow recipe gains the benefit of being able to directly manipulate the version numbers of dependency packages.

This improves the setup, because the test suite can now be validated against pre-release versions of the Npgsql package.
Npgsql is important for CrateDB, because the .NET connectivity relies on it, provided by its PostgreSQL wire compatibility.

[coderabbitai]

Walkthrough

Two GitHub Actions workflows were updated to add an npgsql-version matrix (including 8.*, 9.*, and prerelease), remove a deprecated "Set up uv" step, and replace single-step test invocations with multi-line scripts that conditionally install the appropriate Npgsql/Npgsql.EntityFrameworkCore.PostgreSQL package (handling prerelease, latest, and pinned versions), list packages, and run tests in their respective csharp directories.

Changes

Cohort / File(s)	Summary
EFCore workflow \.github/workflows/lang-csharp-efcore.yml	Added npgsql-version matrix and included it in the workflow display name; removed "Set up uv" step; replaced Validate step with a script that sets working directory to by-language/csharp-efcore, conditionally installs Npgsql.EntityFrameworkCore.PostgreSQL (--prerelease for prerelease, --version=* for latest, --version=<value> otherwise), lists packages, and runs dotnet test.
Npgsql workflow \.github/workflows/lang-csharp-npgsql.yml	Expanded npgsql-version matrix to include 8.*, 9.*, and prerelease; removed "Set up uv" step; replaced the single-step validation with a multi-line script that cds into by-language/csharp-npgsql, conditionally installs Npgsql (handling prerelease, latest, and pinned versions), lists packages, and runs dotnet test.

Sequence Diagram(s)

sequenceDiagram
  participant GH as GitHub Actions Runner
  participant Repo as Repository
  participant Dotnet as dotnet CLI

  rect rgb(250,250,255)
  GH->>Repo: checkout
  GH->>Dotnet: setup dotnet (existing)
  end

  Note right of GH: For each matrix value (npgsql-version)
  rect rgb(245,255,240)
  GH->>GH: set NPGSQL_VERSION = matrix.npgsql-version
  GH->>Repo: cd by-language/csharp-efcore or csharp-npgsql
  alt NPGSQL_VERSION == "prerelease"
    GH->>Dotnet: dotnet add package <Package> --prerelease
  else NPGSQL_VERSION == "latest"
    GH->>Dotnet: dotnet add package <Package> --version=*
  else
    GH->>Dotnet: dotnet add package <Package> --version=<NPGSQL_VERSION>
  end
  GH->>Dotnet: dotnet list package
  GH->>Dotnet: dotnet test
  end

Loading

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• Verify conditional install branches (prerelease vs latest vs pinned) are implemented exactly as intended.
• Confirm display-name interpolation and matrix syntax are correct.
• Ensure working directories (by-language/csharp-efcore, by-language/csharp-npgsql) and test commands match repository layout.

Poem

🐰 I hopped through YAML with a joyful twitch,
Planted version rows and fixed a glitch.
With prerelease hops and pinned-version tunes,
CI hums softly beneath the moons. ✨

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: improving .NET/CI testing with support for pre-release versions of Npgsql, which matches the core objective of the changeset.
Description check	✅ Passed	The description is directly related to the changeset, explaining the motivation (pre-release Npgsql testing), the trade-off (retiring ngr), and the technical context (Npgsql's importance for .NET connectivity).
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch npgsql-unobfuscate-version-pinning

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