Fix override error with _reload_scripts in ScriptLanguageExtension

[Naros]

Fixes #95770

Error:

ERROR: Required virtual method MyLanguage::_reload_scripts must be overridden before calling.
   at: _gdvirtual__reload_scripts_call (./core/object/script_language_extension.h:589)

This blocks the ability for any custom language extension to hot reload scripts.

[Mickeon]

Oh goodness me, that's so many unfilled descriptions. It hurts my soul.

[Naros]

Oh goodness me, that's so many unfilled descriptions. It hurts my soul.

Ya well, the extension classes were never documented; though it's on my radar to do it as time permits 😁

[raulsntos]

Looks like a PR for this already exists:

• Fix virtual binding for ScriptLanguageExtension::_reload_scripts #95730

[akien-mga]

Indeed, duplicate of #95730.