chore(scripts): remove devDeps defined in monorepo root

[trivikr]

Issue

Related to using root tsconfig for all clients in aws-sdk-js-v3
Refs: #1307

Description

Removes devDeps defined in monorepo root from clients.
Individual devDeps, if present, were removed in #3139

Testing

Testing that the packages work without dependencies is done in #3139

Verified that dependencies are not added during client generation with client-acm:

$ sed -n 53,58p clients/client-acm/package.json 
  },
  "devDependencies": {
    "@aws-sdk/service-client-documentation-generator": "3.38.0",
    "@types/node": "^12.7.5"
  },
  "engines": {

$ yarn generate-clients -g codegen/sdk-codegen/aws-models/acm.json -n
...
copying @aws-sdk/client-acm from /local/home/trivikr/workspace/backup/backup-aws-sdk-js-v3/codegen/sdk-codegen/build/smithyprojections/sdk-codegen/acm.2015-12-08/typescript-codegen to /local/home/trivikr/workspace/backup/backup-aws-sdk-js-v3/clients
Done in 13.50s.

$ sed -n 53,58p clients/client-acm/package.json 
  },
  "devDependencies": {
    "@aws-sdk/service-client-documentation-generator": "3.38.0",
    "@types/node": "^12.7.5"
  },
  "engines": {

Additional context

Discussion in lerna lerna/lerna#1079

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[trivikr]

Moving to draft till release automation moves to using build:docs
Currently it calls ./node_modules/.bin/typedoc in each client.

[codecov-commenter]

Codecov Report

Merging #3138 (8343f08) into main (f6a3ef5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3138   +/-   ##
=======================================
  Coverage   75.19%   75.19%           
=======================================
  Files         474      474           
  Lines       20721    20721           
  Branches     4755     4755           
=======================================
  Hits        15581    15581           
  Misses       5140     5140           

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[AllanZhengYP]

Have you checked if we can also remove the @aws-sdk/service-client-documentation-generator?

[trivikr]

We should be able to remove @aws-sdk/service-client-documentation-generator if it's defined in root package.json
We can take it up in a separate PR as it's an internal dependency and will need additional testing with docs generation.

[github-actions]

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