[CCI] Update webpack to v5

[andreymyssak]

Description

Improved version of https://github.com/opensearch-project/oui/pull/765. It would take a long time to address all the potential improvements, so I created a new PR where I applied them.

Run the following commands again to see if there are any errors:

• [X] yarn build
• [X] yarn build-docs
• [X] yarn start
• [X] yarn test-unit
• [X] yarn lint

Issues Resolved

https://github.com/opensearch-project/oui/issues/584

Check List

• [ ] New functionality includes testing.
• [ ] New functionality has been documented.
• [X] All tests pass
  • [X] yarn lint
  • [X] yarn test-unit
• [X] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

For more information on following Developer Certificate of Origin and signing off your commits, please check here.