Obsolete configuration parameter exclude_uid_1 should be removed

Problem/Motivation

The exclude_uid_1 is an obsolete settings parameter which was replaced by the roles functionality at #3396895 and makes the configuration form fail with the following message:

Warning message
Schema errors for cookiebot.settings with the following errors: cookiebot.settings:exclude_uid_1 missing schema. These errors mean there is configuration that does not comply with its schema. This is not a fatal error, but it is recommended to fix these issues. For more information on configuration schemas, check out the documentation → .

Steps to reproduce

1. Install module
2. Go to the Cookiebot configuration page /admin/config/cookiebot
3. Save the configuration
4. Check the warning message

Proposed resolution

Just remove the unused parameter in cookiebot.settings.yml file.