chore(postinstall-node-version-check): remove unused package

[trivikr]

Issue

Refs: #2619

Description

Removes unused package postinstall-node-version-check.
The warning will now be emitted in runtimeConfig

Testing

N/A

Additional context

PR which adds emitWarning code in runtimeConfig #2619
Decision when yarn started removing postinstall scripts #2594 (comment)

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AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 3c1ef7c
• Result: SUCCEEDED
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Codecov Report

❗ No coverage uploaded for pull request base (main@5c9152a). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2620   +/-   ##
=======================================
  Coverage        ?   60.61%           
=======================================
  Files           ?      514           
  Lines           ?    27647           
  Branches        ?     6796           
=======================================
  Hits            ?    16758           
  Misses          ?    10889           
  Partials        ?        0           

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