fix(scripts): log when types not present in downlevel script

[trivikr]

Issue

Internal JS-3107
Follow-up in JS-3106

Description

Los instead of throwing error in downlevel script.

Reason for the change: We only build the packages to be published in new release automation scripts. Making this change to ignore when types are not available for any package. We'll run downlevel only for the changed packages as a follow-up.

Testing

$ cd private/aws-echo-service

$ rm -rf dist-types

$ cd ../../

$ yarn build:types:downlevel                                            
yarn run v1.22.17
$ node --es-module-specifier-resolution=node ./scripts/downlevel-dts
The types for "aws-echo-service" do not exist.

Done in 5.22s.

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