Patch prometheus client (#24651)

* test

* format and handle quotes

* update

* remove unused code

* format

* update

* Fix

* fix

* Format

* Fix

* exact behavior match

* Update datadog_checks_base/changelog.d/24651.changed

* fix license headers

* add a test and explicitly apply patch

* fix test

* remove comment

* Apply suggestions from code review

Co-authored-by: Sarah Witt <sarah.witt@datadoghq.com>

* Add config flag and update changelog

* Apply suggestions

* fix tests

* fix linting c544396

Author: alexeypilyugin