Remove map_legacy_users from example configuration

[nblock]

This option was removed in #2411

• have read the CONTRIBUTING.md file
• raised a GitHub issue or discussed it on the projects chat beforehand
• added unit tests
• added integration tests
• updated documentation if needed
• updated CHANGELOG.md

[ghost]

Pull Request Revisions

Revision	Description
r1	Removed commented legacy user mapping Deleted commented configuration block for mapping legacy users from pre-0.24.0 versions in config-example.yaml

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☑️ AI review skipped for r1

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