Replace RegExp.test() for simple string comparison with String.prototype method possibly

Problem/Motivation

Some of RegExp.test() can replace with method which is defined String.prototype. In core/modules/toolbar/js/escapeAdmin.js, checks that window.location.search includes 'destination='.
This case can change to window.location.search.includes('destination=').

Proposed resolution

Replace possibly RegExp for simple string comparison with
method which is defined String.prototype.

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet