fix: replace prepublishOnly script with downlevel-dts

[trivikr]

Issue

Fixes: #2474

Description

The prepublishOnly script was running in our release automation with the following error:

npm WARN lifecycle @aws-sdk/[email protected]~prepublishOnly: cannot run in wd @aws-sdk/[email protected] yarn build && downlevel-dts dist/types dist/types/ts3.4 (wd=.)

Due to this error, the downlevelled types were not getting published.
This happened as we ran npm publish script using package directory in our release automation, and npm cli ran prepublishOnly script from root directory.

The fix is to rename prepublishOnly to downlevel-dts and call it explicitly from our release automation. The yarn build is not required as dist folder is already present.

Testing

• Similar change was tested by explicitly calling prepublishOnly script with package directory in release automation scripts.
• This change will be tested post merge by replacing prepublishOnly call with downlevel-dts

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[codecov-commenter]

Codecov Report

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The diff coverage is n/a.

@@           Coverage Diff           @@
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  Hits            ?    15729           
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  Partials        ?        0           

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