Migrate solution to .NET 10

[Purva-Patki]

• Retarget all projects to net10.0 (was netstandard2.1 / net6.0 / netcoreapp3.1)

• Replace legacy ASP.NET Core 2.2 package refs with FrameworkReference Microsoft.AspNetCore.App

• Bump JwtBearer and System.Drawing.Common to satisfy MISE 1.35.0 transitive requirements

• Remove dead 'using static HostingApplication' imports removed after ASP.NET Core 2.2

• Update CI and Azure DevOps pipelines to install .NET 10 SDK

Co-authored-by: Copilot 223556219+Copilot@users.noreply.github.com

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