Fix init order in AbstractPortUnificationServer

[AlbumenJ]

What is the purpose of the change?

Fix #12621

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[louqing13129]

please dubbo version 3.2.13, dubbo-tri JAR can not download. JAVA project run failed.ERROR|o.s.b.SpringApplication:|Application run failed java.lang.IllegalStateException: Extension instance (name: tri, class: interface org.apache.dubbo.rpc.Protocol) couldn't be instantiated: null

[EarthChen]

LGTM