Refactor (if feasible) uses of the jQuery parents function to use vanillaJS

Problem/Motivation

As mentioned in the parent issue #3238306: [META] Where possible, refactor existing jQuery uses to vanillaJS to reduce jQuery footprint → , we are working towards reducing our jQuery footprint. One of the ways to accomplish this is to reduce the number of jQuery features used in Drupal core. We have added eslint rules that identify specific features and fail tests when those features are in use.

There are (or will be) individual issues for each jQuery-use eslint rule. This one is specific to jquery/no-parents, which targets the jQuery parents function.

Steps to reproduce

Proposed resolution

Remaining tasks

• In core/.eslintrc.jquery.json Change "jquery/no-parents": 0, to "jquery/no-parents": 2, to enable eslint checks for uses of jQuery parent(). With this change, you'll be able to see uses of the undesirable jQuery feature by running yarn lint:core-js-passing from the core directory
• If it's determined to be feasible, refactor those uses of jQuery parents() to use Vanilla (native) JavaScript instead.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet