dillon1000/react

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Configure "Always On" Feature Flags for React Native (#28519)

## Summary

This PR is a subset of https://github.com/facebook/react/pull/28425,
which only includes the feature flags that will be configured as "always
on" (i.e. not "dynamic").

The following list summarizes the feature flag changes:

* RN FB
  * Always Enable
    * enableCache
    * enableCustomElementPropertySupport
* RN OSS
  * Always Enable
    * disableLegacyContext
    * enableCache
    * enableCustomElementPropertySupport
* RN Test
  * Always Enable
    * disableModulePatternComponents
    * enableCustomElementPropertySupport

## How did you test this change?

Ran the following successfully:

```
$ yarn test
$ yarn flow native
$ yarn flow fabric
```
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M packages/shared/forks/ReactFeatureFlags.native-fb.js ModifiedM packages/shared/forks/ReactFeatureFlags.native-oss.js ModifiedM packages/shared/forks/ReactFeatureFlags.test-renderer.native.js Modified
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