settings form test doesn't take config override into account

Problem/Motivation

Because my local DDEV setup does not have the same URL for tika as production, I've put a config override into settings.local.php:

> $config['search_api_attachments.admin_config']['tika_server_extractor_configuration']['host'] = 'tika';

However, when I submit the form to test the extraction works, it's using the value in saved config. This means I can't check that it works on DDEV.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes