Inline Task.call without Executor (#49906)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49906

Task.call is equivalent to a try-catch and wrapping the result in a Task. Inlining this is cheaper than creating a TaskCompletionSource and a Runnable.

Changelog: [Internal]

Reviewed By: cortinico

Differential Revision: D70803554

fbshipit-source-id: 0886176be974eff67c983ce1475ad685a8021b14