Fix build version being lost on Android builds

[smoogipoo]

Fixes #34185
Initial commentary in #34185 (comment)

I've had a similar hack here stashed away for another internal project. It generates the following file across all projects:

~/Repos/osu/osu.Desktop $ cat obj/Debug/net8.0/DeployProperties.g.cs
//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.Reflection;

[assembly: osu.Game.Utils.OfficialBuildAttribute("2025.715.15-tachyon")]

// Generated by the MSBuild WriteCodeFragment class.

... which is the same thing our internal deploy project does, minus the version name which is added in this patch. Thus this also cleans up the deploy project a bit (see referring PRs).

[smoogipoo]

@bdach Consider this a fallback because I'd highly prefer any solution that gets around the version being trimmed on Android.

[smoogipoo]

Have rewritten this to use a more canonical implementation, because I noticed Sentry already outputs its own file: https://github.com/getsentry/sentry-dotnet/blob/935ce5b4a3679fbd9e45edefd781df26efd4d92d/src/Sentry/buildTransitive/Sentry.targets#L34-L55

But, this is itself very canonical code across many projects: https://grep.app/search?q=%3CWriteCodeFragment

[smoogipoo]

Sorry for the force pushes, I'll call it here 😅 Basically I'm not convinced Sentry is doing it correctly based on actual behaviour, so I referred to other examples. Pushed away the initial revision too, because I don't think there's a world where that's reverted to in any case.

[bdach]

In terms of a 'review' I suppose most I have to offer is that #34232 is a potential alternative to this.

I'm not sure I have any inherent preference as to which approach is better, personally, both have a few ugly warts.