…k client (greeflas)This PR was squashed before being merged into the 5.4 branch.Discussion----------[HttpClient] Add method to set response factory in mock client| Q             | A| ------------- | ---| Branch?       | 5.4| Bug fix?      | no| New feature?  | yes| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->| Tickets       |Fix#40620 <!-- prefix each issue number with "Fix #", no need to create an issue if none exist, explain below instead -->| License       | MIT| Doc PR        |symfony/symfony-docs#15883 <!-- required for new features --><!--Replace this notice by a short README for your feature/bugfix. This will help peopleunderstand your PR and can be used as a start for the documentation.Additionally (seehttps://symfony.com/releases): - Always add tests and ensure they pass. - Never break backward compatibility (seehttps://symfony.com/bc). - Bug fixes must be submitted against the lowest maintained branch where they apply   (lowest branches are regularly merged to upper ones so they get the fixes too.) - Features and deprecations must be submitted against branch 5.x. - Changelog entry should followhttps://symfony.com/doc/current/contributing/code/conventions.html#writing-a-changelog-entry-->Commits-------2e028cc [HttpClient] Add method to set response factory in mock client