refactor: removed Object.es8 {entries, values} from js polyfills

[ecreeth]

Summary:

Both hermes and JSC supports Object.{values & entries}, so this polyfills aren't used any more.

Changelog:

[GENERAL][REMOVED]: removed Object.{values & entries} from polyfills

Test Plan:

1. We can confirm with hermes tests: https://github.com/facebook/hermes/blob/main/test/hermes/object-functions.js#L256
2. Remove this polyfills and check that the code runs as expected.
3. You can also run: console.log(Object.entries.toString()); and verify that this is [native code]

[github-actions]

	Warnings
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Generated by 🚫 dangerJS against 5d5bfe2

[robhogan]

Thanks for this!

Also, confirmed these have both been supported on iOS JSC since 10.3, so we're good for the current RN minimum of 13.4.

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[github-actions]

This pull request was successfully merged by @ecreeth in 04c501f.

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