ICU-22965 Fix the problems we had with the maven deploy for ICU 76.1

[mihnita]

The blocker was the missing <name> element, which is mandatory.
See https://central.sonatype.org/publish/requirements/#project-name-description-and-url

The second problem was that all modules were staged, not just the three we normally publish.

Checklist

• Required: Issue filed: https://unicode-org.atlassian.net/browse/ICU-22965
• Required: The PR title must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• Required: The PR description must include the link to the Jira Issue, for example by completing the URL in the first checklist item
• Required: Each commit message must be prefixed with a JIRA Issue number. Example: "ICU-1234 Fix xyz"
• Issue accepted (done by Technical Committee after discussion)
• Tests included, if applicable
• API docs and/or User Guide docs changed or added, if applicable