[v5] Replace CaseSensitivePathsPlugin with eslint import/no-unresolved rule
Created by: raix
Is your proposal related to a problem?
The CaseSensitivePathsPlugin is expensive, would be better for performance to use eslint rule https://github.com/import-js/eslint-plugin-import/blob/master/docs/rules/no-unresolved.md#casesensitive
referece: https://github.com/facebook/create-react-app/pull/11201#discussion_r681096819
Describe the solution you'd like
Describe alternatives you've considered
Additional context
https://github.com/facebook/create-react-app/pull/11201#pullrequestreview-720369833