Added missing TextEncoder and TextDecoder to jest-envirotment-node

[chyzwar]

Summary

Added missing globals to jest-environment-node. Use the same approach as the URL.

These were added in node 11: https://nodejs.org/api/globals.html#globals_textdecoder

Test plan

I tested locally with yarn link. I am not sure if pipeline have node11?

[chyzwar]

Should we use these node globals to polyfill on jest-environment-jsdom?

[jeysal]

Node 11 ref nodejs/node@932be01
Same thing for URL{,SearchParams} #6231

Assuming we don't need a test for this since #6231 didn't have one either?

[SimenB]

Should we use these node globals to polyfill on jest-environment-jsdom?

I don't think so, that's jsdom's responsibility

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@c3a0167). Click here to learn what that means.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #8022   +/-   ##
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  Coverage          ?   64.08%           
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  Files             ?      262           
  Lines             ?    10175           
  Branches          ?     1820           
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  Hits              ?     6521           
  Misses            ?     3253           
  Partials          ?      401

Impacted Files	Coverage Δ
packages/jest-environment-node/src/index.ts	48.48% <0%> (ø)

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