fix(scripts): disable downleveling for private workspaces

[trivikr]

Issue

Attempt to fix JS-3107

Description

Skips downleveling for private packages

Testing

Verified that downleveling happens in non-private package (say client-s3) and not in private package (say client-echo-service):

Before

$ aws-echo-service> ls dist-types          
commands                EchoService.d.ts  models     runtimeConfig.browser.d.ts  runtimeConfig.native.d.ts
EchoServiceClient.d.ts  index.d.ts        protocols  runtimeConfig.d.ts          runtimeConfig.shared.d.ts

$ client-s3> ls dist-types 
commands        models      runtimeConfig.browser.d.ts  runtimeConfig.shared.d.ts  waiters
endpoints.d.ts  pagination  runtimeConfig.d.ts          S3Client.d.ts
index.d.ts      protocols   runtimeConfig.native.d.ts   S3.d.ts

After

$ aws-echo-service> ls dist-types          
commands                EchoService.d.ts  models     runtimeConfig.browser.d.ts  runtimeConfig.native.d.ts
EchoServiceClient.d.ts  index.d.ts        protocols  runtimeConfig.d.ts          runtimeConfig.shared.d.ts

$ client-s3> ls dist-types
commands        models      runtimeConfig.browser.d.ts  runtimeConfig.shared.d.ts  ts3.4
endpoints.d.ts  pagination  runtimeConfig.d.ts          S3Client.d.ts              waiters
index.d.ts      protocols   runtimeConfig.native.d.ts   S3.d.ts

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[trivikr]

Replaced by #3307

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