CONFIG: Update NuGet dependencies and modernise ADotNet build/PR workflows

[perirrs]

Summary

Brings MeshClient up to the .NET 10 modernisation standard.

closes AB#29755

Dependency updates (CONFIG)

• Microsoft.Extensions.DependencyInjection 10.0.8 -> 10.0.9
• Microsoft.Extensions.Configuration 10.0.8 -> 10.0.9
• Microsoft.Extensions.Configuration.Json 10.0.8 -> 10.0.9
• Microsoft.Extensions.Configuration.Binder 10.0.8 -> 10.0.9
• Microsoft.Extensions.Configuration.EnvironmentVariables 10.0.8 -> 10.0.9
• Microsoft.Extensions.Hosting 10.0.8 -> 10.0.9
• Microsoft.NET.Test.Sdk 18.5.1 -> 18.7.0
• WireMock.Net 2.6.0 -> 2.11.0
• ADotNet 4.3.0 -> 5.0.0
• dependabot: add FluentAssertions ignore rule (locked at [7.2.2])

Workflow modernisation (CODE RUB)

• ADotNet components -> latest (CheckoutTaskV5 / SetupDotNetTaskV5 / LabelJobV3 / TagJobV2 / PublishJobV4); build.yml now on Node-24 actions (checkout@v5, setup-dotnet@v5, github-script@v8)
• prLinter.yml: added Set Author As PR Assignee; RequireIssueOrTask -> V2 (excludes dependabot[bot]); Label -> V3
• Dropped the PR branch-filter from build.yml (kept the filter on prLinter, per Christo)

Validation

• Build: 0 errors, 0 obsolete warnings
• Tests: 310 pass (292 Unit + 8 Integration + 10 Acceptance)
• Workflows regenerated from the Infrastructure project (idempotent, not hand-edited)

Note for reviewer

• WireMock.Net 2.11.0 (latest) reduces the pre-existing Scriban.Signed vuln from High -> Moderate (test-only transitive, not shipped). Fully clearing it would require pinning the transitive (Rule CLIENTS: Mesh Client #9 sign-off) - left as-is for a decision.

[Copilot]

Pull request overview

Updates MeshClient to align with the project’s .NET 10 modernization standard by refreshing NuGet dependencies and regenerating/modernizing GitHub workflows via ADotNet v5.

Changes:

• Bumped Microsoft.Extensions.* packages to 10.0.9, updated Microsoft.NET.Test.Sdk to 18.7.0, and updated test dependency WireMock.Net to 2.11.0.
• Upgraded NEL.MESH.Infrastructure to ADotNet 5.0.0 and updated pipeline generation to newer ADotNet workflow components.
• Modernized GitHub workflows (newer checkout/setup-dotnet/github-script actions; PR linter enhancements incl. assignee automation).

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
NEL.MESH/NEL.MESH.csproj	Updates Microsoft.Extensions.DependencyInjection / Hosting to 10.0.9.
NEL.MESH.UI/NEL.MESH.UI.csproj	Updates Microsoft.Extensions.Configuration* packages to 10.0.9.
NEL.MESH.Tests.Unit/NEL.MESH.Tests.Unit.csproj	Updates test SDK + config packages to 10.0.9 / 18.7.0.
NEL.MESH.Tests.Integration/NEL.MESH.Tests.Integration.csproj	Updates test SDK + config packages to 10.0.9 / 18.7.0.
NEL.MESH.Tests.Integration.Witness/NEL.MESH.Tests.Integration.Witness.csproj	Updates test SDK + config packages to 10.0.9 / 18.7.0.
NEL.MESH.Tests.Acceptance/NEL.MESH.Tests.Acceptance.csproj	Updates test SDK + config packages and bumps WireMock.Net to 2.11.0.
NEL.MESH.Infrastructure/Services/ScriptGenerationService.cs	Updates ADotNet pipeline generation to newer task/job versions and PR linter jobs.
NEL.MESH.Infrastructure/NEL.MESH.Infrastructure.csproj	Upgrades ADotNet from 4.3.0 to 5.0.0.
.github/workflows/prLinter.yml	Updates actions versions, adds fork guards, and adds “Set Author As PR Assignee” job.
.github/workflows/build.yml	Updates checkout / setup-dotnet actions to v5 and adjusts PR trigger filtering.
.github/dependabot.yml	Adds FluentAssertions ignore rules.