Reverts "Timing: Fixes timer when app get into background (#24649)" (#27073)
Reverts "Timing: Fixes timer when app get into background (#24649)" (#27073)

Summary:
This PR reverts commit https://github.com/facebook/react-native/commit/338298417f8077dee177057c57b38671b4ec8c75 that is causing https://github.com/facebook/react-native/issues/26696 #26995.
> app would be closed immediately after going to background on iOS 13.1/13.2 and was investigated by minhtc https://github.com/facebook/react-native/issues/26696#issuecomment-548056694. The commit that is being reverted is apparently causing the app to be closed immediately. This has to be reverted in master separately as the file differs there.

Similar PR for 0.61. branch https://github.com/facebook/react-native/pull/27065

## Changelog

[iOS] [Fixed] - Fix apps crashing on iOS 13.x when running timer in the background
Pull Request resolved: https://github.com/facebook/react-native/pull/27073

Test Plan: Try [this](https://github.com/facebook/react-native/commit/338298417f8077dee177057c57b38671b4ec8c75#commitcomment-35745287) snippet on iOS 13.1/13.2, the app should not crash anymore

Differential Revision: D18323679

Pulled By: cpojer

fbshipit-source-id: 3af7036a0e1d3811924e581c649b16e5a4667e83

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