Ditch the requirement of using the drupal-ckeditor-plugins repository

Problem/Motivation

Using the https://panopoly.gitlab.io/drupal-ckeditor-plugins is good in some custom websites only
and with the choice of the developer to use.
Not to add extra calls for the static repo on every composer install/require or update

Proposed resolution

Let developers select what they like to use in their websites or custom profiles
#3204935: Adjust composer.libraries.json to match webform standards and prevent webform issues
Remove the following form the composer.json file

    "drupal-ckeditor-plugins": {
      "type": "composer",
      "url": "https://panopoly.gitlab.io/drupal-ckeditor-plugins"
    }

and

    "drupal-ckeditor-plugin/fakeobjects": "~4.0"

Remaining tasks

• ☑ File an issue
• ☑ Addition/Change/Update/Fix
• ☑ Testing to ensure no regression
• ☐ Automated unit/functional testing coverage
• ☐ Documentation
• ☑ Code review by maintainers
• ☑ Full testing and approval
• ☑ Credit contributors
• ☑ Review with the product owner
• ☐ Update Release Notes
• ☐ Release

User interface changes

• N/A

API changes

• N/A

Data model changes

• N/A