add lint command to react-scripts

[KurtGokhan]

This PR adds ability to run eslint with react-scripts lint command. It runs the eslint with the same config as build command. Unlike the previous PR attempts, this one does not accept CLI arguments and is more opinionated just like the build command.

Note: This works with npm, yarn, yarn berry and probably every other package manager.

Related issue: #1217
Related PRs: #2729 #3850 #2625

[KurtGokhan]

Is there something I can do to make this PR more appealing? @iansu @mrmckeb tagging you because you are reviewers.

[KurtGokhan]

Removed lint script from package.json as per this comment
Also updated to latest upstream.

Tested a bit more with Yarn PnP. It requires nodeLinker and it gets a bit more complicated when you try to use custom eslint plugins. So it is not perfect. But this PR generally upholds the "one dependency" goal.

[KurtGokhan]

I discovered that @rushstack/eslint-patch does not work well with yarn workspaces.