Incomplete export template install is not reported

[mathiasplans]

Tested versions

Godot 4.4.1

System information

Windows 10

Issue description

I have a Windows machine where the C drive is almost completely full. I installed the export templates from Export Template Manager and it looked successful. Then, I exported my project. But the resulting .exe file was an empty file with size of 0 bytes.

Looking into Godot/export_templates/4.4.1.stable, I noticed that most files were empty. E.g., windows_release_*.exe were all 0 size files. I fixed it by uninstalling the export template, making more room on my C drive, and then installing them again.

However, I think Export Template Manager should report it to me when the install was incomplete and give me a reason as well. In this case, not enough room on the disk.

Steps to reproduce

1. Have a C drive with little free space (e.g., 1GB)
2. Install export templates from the Export Template Manager
3. Export your project
4. See that the .exe size is 0
5. See that some .exe files in the installed export templates are also empty

Minimal reproduction project (MRP)

An exportable project (I believe it just has to have a root node).

[bruvzg]

Same issue as #105742

Related PRs:
#105755
#105757