Brightness and Contrast have disappeared

Brightness & Contrast as an adjustment layer is still available, but you’ll need to first make a Light adjustment Layer, then from the Properties panel fly-out menu you can chose one of two Legacy Brightness & Contrast adjustment layers.

https://helpx.adobe.com/photoshop/desktop/create-manage-layers/color-adjustment-fill-layers/adjust-image-lighting-with-light.html

Also tested older actions made with Brightness & Contrast adjustment layers and they seem to work in Photoshop 27.10.

Version: 27.10