### Godot version

4.2 247c354

### System information

Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce GTX 1060 (NVIDIA; 30.0.15.1403) - Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz (8 Threads)

### Issue description

#75778 exposed `_validate_property()` to scripting. It's implemented in GDScript and C#, but not GDExtension (depends on #78634).
https://github.com/godotengine/godot/blob/247c3548d810136ffe9c1694cd76db3236efaa90/core/object/script_language_extension.h#L685-L687

Relevant discussion: https://github.com/godotengine/godot/pull/75778#discussion_r1307294940

### Steps to reproduce

1. Add GDExtension script
2. Use `_validate_property()`

### Minimal reproduction project

N/A
* @since 4.1
 *
 * Calls a method on a Variant.
 *
 * @param p_self A pointer to the Variant.
 * @param p_method A pointer to a StringName identifying the method.
 * @param p_args A pointer to a C array of Variant.
 * @param p_argument_count The number of arguments.
 * @param r_return A pointer a Variant which will be assigned the return value.
 * @param r_error A pointer the structure which will hold error information.
 *
 * @see Variant::callp()
 */
typedef void (*GDExtensionInterfaceVariantCall)(GDExtensionVariantPtr p_self, GDExtensionConstStringNamePtr p_method, const GDExtensionConstVariantPtr *p_args, GDExtensionInt p_argument_count, GDExtensionUninitializedVariantPtr r_return, GDExtensionCallError *r_error);
/**
 * @name variant_call_static
 * @since 4.1
 *
 * Calls a static method on a Variant.
 *
 * @param p_self A pointer to the Variant.
 * @param p_method A pointer to a StringName identifying the method.
 * @param p_args A pointer to a C array of Variant.
 * @param p_argument_count The number of arguments.
 * @param r_return A pointer a Variant which will be assigned the return value.
 * @param r_error A pointer the structure which will be updated with error information.
 *
 * @see Variant::call_static()
 */
typedef void (*GDExtensionInterfaceVariantCallStatic)(GDExtensionVariantType p_type, GDExtensionConstStringNamePtr p_method, const GDExtensionConstVariantPtr *p_args, GDExtensionInt p_argument_count, GDExtensionUninitializedVariantPtr r_return, GDExtensionCallError *r_error);