Use stable Reanimated and Worklets (#4473)

## Description

Moves the example apps and the library dev dependency from
Reanimated/Worklets nightlies to the stable releases (4.6.0 / 0.12.1).
The nightly worklets patch (jest mock fix) is no longer needed with the
stable release, so the patch file and its references are removed.

`expo` is additionally pinned to exact 57.0.16. The patched resolution
is keyed on the `expo-modules-core` range that `expo` declares
(`~57.0.13`), so a future expo release changing that range would
silently stop applying the patch; an exact pin prevents that.

## Test plan

- yarn install
- Build expo-example on Android and iOS, check that `expo-modules-core`
compiles against Worklets 0.12.1.