yushimatenjin c293f29f57 Fix rename legacy component lifecycles (#22125)
Summary:
Adding an “UNSAFE_” prefix to `componentWillMount`.

If this PR fixes an issue, type "Fixes #issueNumber" to automatically close the issue when the PR is merged.

- [x] yarn test
- [x] yarn flow
- [x] yarn flow-check-ios
- [x] yarn flow-check-android

[General] [Fixed] - adding an UNSAFE_ prefix
Pull Request resolved: https://github.com/facebook/react-native/pull/22125

Differential Revision: D13237831

Pulled By: mmmulani

fbshipit-source-id: b4ca1e4628f93e89fd5680c40b0e3f7c7db6ad38
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