Remove the multiuser directory

[vinokurig]

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What does this PR do?

Remove the redundant multiuser directory

Screenshot/screencast of this PR

What issues does this PR fix or reference?

https://github.com/eclipse-che/che/issues/22710

How to test this PR?

PR Checklist

As the author of this Pull Request I made sure that:

• [ ] The Eclipse Contributor Agreement is valid
• [ ] Code produced is complete
• [ ] Code builds without errors
• [ ] Tests are covering the bugfix
• [ ] The repository devfile is up to date and works
• [ ] Sections What issues does this PR fix or reference and How to test this PR completed
• [ ] Relevant user documentation updated
• [ ] Relevant contributing documentation updated
• [ ] CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[vinokurig]

/retest

[vinokurig]

/retest

[vinokurig]

/retest

[vinokurig]

/retest

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ibuziuk, tolusha, vinokurig

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[ibuziuk]

@vinokurig looks like pom.xml need to be updated after https://github.com/eclipse-che/che-server/pull/799

[openshift-ci[bot]]

New changes are detected. LGTM label has been removed.