chore: use to configure context path

[romansmirnov]

Which problem does the PR fix?

Following up with https://github.com/camunda/zeebe/pull/17467, Zeebe was migrated to Spring Webmvc. That way, the property to configure the context path in the Gateway changes. Therefore, this PR set the server.servlet.context-path property to set the context path.

What's in this PR?

Checklist

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