Readd support for web platform exports when using the C# (.NET) version of the engine

[Kezzo]

Godot version

v4.0.beta10.mono.official [d0398f6]

System information

macOS Monterey 12.5.1 (21G83)

Issue description

In a fresh project created with v4.0beta10 and export templates downloaded and installed, the web export templates files are missing at the expected path. This makes it impossible to create web builds afaik.

Steps to reproduce

1. Create new godot project with v4.0beta10
2. Create web export preset
3. Download export templates
4. Click on open folder in the export template download window
5. Observe that the required files for web exports are missing

Minimal reproduction project

N/A

[Calinou]

There are no C# export templates for HTML5 yet due to missing upstream support in .NET 6 (.NET 7 didn't address this).

That said, there are significant issues with the HTML5 export in 4.0, such as #68647 and #70691. I would recommend using 3.x if targeting HTML5 for now, regardless of whether you're using C# or not.

[Delpire]

What is the missing upstream support from .NET we're waiting on to get HTML5 support? Can we link that item here and then in whatever documentation gets created?

Not having HTML5 support for Godot 4 is preventing me from using Godot 4 when participating in game jams as I prefer uploading web builds.