Cannot export C# array of type Vector2I, Vector3I, Vector4I: "GD0102: The type of the exported field is not supported"

### Tested versions

4.2.2 stable

### System information

Windows 10, Godot 4.2.2 stable

### Issue description

In the [manual](https://docs.godotengine.org/en/stable/tutorials/scripting/c_sharp/c_sharp_exports.html), it says:
> C# arrays can exported as long as the element type is a [Variant-compatible type](https://docs.godotengine.org/en/stable/tutorials/scripting/c_sharp/c_sharp_variant.html#c-sharp-variant-compatible-types).

Vector2I, Vector3I, and Vector4I are listed as [Variant compatible types](https://docs.godotengine.org/en/stable/tutorials/scripting/c_sharp/c_sharp_variant.html#c-sharp-variant-compatible-types) in the manual.

However, when trying to export e.g. an Vector2I array, Godot gives the error: "GD0102: The type of the exported field is not supported"

### Steps to reproduce

Create a C# script with the line:
> [Export] private Vector2I[] testI;

then try to compile.

### Minimal reproduction project (MRP)

N/A

Start by reproducing the error with the C# script line `[Export] private Vector2I[] testI;` in Godot 4.2.2, then trace the C# export validation for array element types and compare it with the manual's Variant-compatible type list. Done means Vector2I, Vector3I, and Vector4I arrays are accepted consistently with the documentation.

Written by the indexing model from the issue text.