Drop Support for .NET 8.0

[devinlyons]

No description provided.

[github-actions]

🔗 Jira task created: SOF-668

[Copilot]

Pull request overview

This PR updates the repository to no longer target .NET 8 by moving projects to .NET 10, along with associated dependency/tooling updates across src, tests, samples, and CI.

Changes:

• Retargets library, test, and sample projects from net8.0 to net10.0 and updates FSharp.Core ranges/versions accordingly.
• Migrates test dependencies to the xUnit v3 ecosystem and removes now-unneeded test Program.fs entrypoints.
• Replaces the legacy .sln with an XML .slnx solution and updates GitHub Actions to install the .NET 10 SDK.

Reviewed changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
tests/FSharp.Data.Validation.Tests/Program.fs	Removes manual test entrypoint source file.
tests/FSharp.Data.Validation.Tests/FSharp.Data.Validation.Tests.fsproj	Retargets to net10 and updates test package references (xUnit v3, FsCheck v3, etc.).
tests/FSharp.Data.Validation.Async.Tests/Tests.fs	Adjusts the test module name for the async test project.
tests/FSharp.Data.Validation.Async.Tests/Program.fs	Removes manual test entrypoint source file.
tests/FSharp.Data.Validation.Async.Tests/FSharp.Data.Validation.Async.Tests.fsproj	Retargets to net10 and updates test package references (xUnit v3, FsCheck v3, etc.).
src/FSharp.Data.Validation/FSharp.Data.Validation.fsproj	Retargets core library to net10 and bumps minimum FSharp.Core.
src/FSharp.Data.Validation.Giraffe/FSharp.Data.Validation.Giraffe.fsproj	Retargets to net10, bumps minimum FSharp.Core, and updates Giraffe dependency range.
src/FSharp.Data.Validation.Async/FSharp.Data.Validation.Async.fsproj	Retargets async library to net10 and bumps minimum FSharp.Core.
src/Directory.Build.props	Pins Microsoft.SourceLink.GitHub to a specific version.
samples/GettingStarted/packages.lock.json	Updates lockfile TFM and FSharp.Core resolution to net10-compatible versions.
samples/GettingStarted/GettingStarted.fsproj	Retargets sample to net10 and bumps minimum FSharp.Core.
samples/FSharp.Data.Validation.Samples/packages.lock.json	Updates lockfile TFM and FSharp.Core resolution to net10-compatible versions.
samples/FSharp.Data.Validation.Samples/FSharp.Data.Validation.Samples.fsproj	Retargets sample to net10 and bumps minimum FSharp.Core.
FSharp.Data.Validation.slnx	Adds new .slnx solution file listing all projects.
FSharp.Data.Validation.sln	Removes legacy .sln solution file.
.github/workflows/test.yml	Updates CI to install .NET 10 SDK.
.github/workflows/release.yml	Updates release workflow to install .NET 10 SDK.
.github/workflows/giraffe-release.yml	Updates Giraffe release workflow to install .NET 10 SDK.

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