fix(protocol_tests): add downlevel-dts script to aws-json-10

[trivikr]

Issue

The scripts were updated in #2537
They were missed in aws-json-10 package, as it was created in parallel #2529

Description

add downlevel-dts script and removes prepublishOnly script from aws-json-10

Testing

CI

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 89eecf8
• Result: SUCCEEDED
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[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@5e3db00). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2540   +/-   ##
=======================================
  Coverage        ?   60.24%           
=======================================
  Files           ?      513           
  Lines           ?    27359           
  Branches        ?     6421           
=======================================
  Hits            ?    16482           
  Misses          ?    10877           
  Partials        ?        0           

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