Codegen doesn't add new dependency in the client if package.json is already present

[trivikr]

Describe the bug
Codegen doesn't add new dependency in the client if package.json is already present

To Reproduce (observed behavior)
This issue was noticed when release script failed in #798

• The PR which added middleware-sdk-sqs feat: sqs md5 validation middleware #719
• It was not added as a dependency when CodeGen was run, as we our generate-clients script doesn't override package.json - if it's already present

  aws-sdk-js-v3/scripts/generate-clients/copy-to-clients.js

  Lines 7 to 17 in 80e6356

  	const overwritablePathnames = [
  	"commands",
  	"models",
  	"protocols",
  	"LICENCE",
  	"runtimeConfig.ts",
  	"runtimeConfig.browser.ts",
  	"runtimeConfig.shared.ts",
  	"index.ts",
  	"endpoints.ts"
  	];

Expected behavior

• generate-clients scripts should read package.json output from CodeGen, and update it to latest lerna dependencies
• if we go ahead with this solution, we'll need another task to update dependencies while merging as lerna would update version everyday post GA. This can be done using GitHub action on merge action.

[trivikr]

This issue caused CI failure when codegen was run after uuid dependency was added #815 (comment)

[trivikr]

Verified that #900 fixed this issue

[lock]

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