Some built-in extension doesn't let you use the new variable system

[MyNameIsRinax]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Since GDevelop introduced its new variable system, some built-in extensions (e.g., Firebase) still haven't received updates that allow you to utilize the latest features,, such as local variables.

Steps to reproduce

Use any conditions/actions from the Firebase extension (or any other built-in extension) with the variable parameter. Then try to search for any local/global variables.

GDevelop platform

Desktop, Web, Mobile

GDevelop version

5.5.220

Platform info

OS (e.g. Windows, Linux, macOS, Android, iOS)

OS Version (e.g. Windows 10, macOS 10.15)

Browser(For Web) (e.g. Chrome, Firefox, Safari)

Device(For Mobile) (e.g. iPhone 12, Samsung Galaxy S21)

Additional context

No response