Update linting set-up in master-private

• Type: Task
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: 7.2.X
• Component/s: Frontend Infrastructure
• Labels:
  • liferay-dxp-72-sp1
  • liferay-fixpack-dxp-2-7210
• Branch Version/s:
  7.2.x
• Backported to Branch:
  Committed
• Epic/Theme:
  • Fi_Internal_Productivity
• Epic Link: fi-build-process-linting
• Sprint: S03E04 - Tacoma
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal-ee/pull/25342
• QA Test Name:
  • source-format-jdk8/0
• QA Test Score: 5

Bring the "master-private" linting infrastructure up-to-date with what we have on the public "master" branch.

This means:

• Update to the latest liferay-npm-scripts (v4.6.0), which knows how to work in "master-private".
• Set up top-level npmscripts.config.js, .eslintignore, and .prettierignore as required.