chore(lint): Migrate eslint config

[BobrImperator]

• Migrates eslint config to the new syntax
• Unifies configs so they're defined only once and imported where needed
• Applies autofixes
• Turned off the 'no-prototype-builtins' rule.

[github-actions]

Some tests with 'continue-on-error: true' have failed:

• test-esa test:one ember-beta

• test-app test:one ember-beta

• test-app test:one ember-canary

• classic-test-app test:one ember-beta

• test-esa test:one ember-canary

  Created by continue-on-error-comment

[github-actions]

Some tests with 'continue-on-error: true' have failed:

• classic-test-app test:one ember-canary

Created by continue-on-error-comment

[marcoow]

what about the todos https://github.com/mainmatter/ember-simple-auth/pull/2804/files#diff-9601a8f6c734c2001be34a2361f76946d19a39a709b5e8c624a2a5a0aade05f2R66 ?

[BobrImperator]

@marcoow they were there in the original file, I don't think we'd like to address them here?

This PR only addresses config migration and formatting that was somehow not applied for other files.
e.g. inconsitencies around spacing and "" -> '' conversion.

[marcoow]

ah I see