fix(util-stream): rename downlevel-dts to build:types:downlevel

[trivikr]

Issue

Internal JS-3127

Description

The util-stream packages contains the original script downlevel-dts added in private, which was renamed to build:types:downlevel in public

Testing

Verified that running build:types:downlevel at top level was successful.

$ yarn build:types:downlevel
yarn run v1.22.17
$ node --es-module-specifier-resolution=node ./scripts/downlevel-dts
Done in 67.61s.

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