[ php-wasm ] Add test-unit-jspi in CI workflow (#2285)

## Motivation for the change, related issues

Based on
[this](#2248 (comment))
comment

This enables the JSPI mode tests alongside `test-unit-asyncify` in CI
workflow.

## Implementation details

Duplication of the `test-unit-asyncify` tests. With two major
differences :

1. JSPI Unit Tests need Node 23 to use JSPI mode. 
2. JSPI Unit Tests need a dedicated Vite config file to add the JSPI
options:

```javascript
execArgv: [
	'--expose-gc',
	'--experimental-wasm-stack-switching',
	'--experimental-wasm-jspi',
], 
```

3. Dispose `php` runtime with `php.exit()` after each test.

## Testing Instructions (or ideally a Blueprint)

CI

Author: mho22