Delete SpringCloudServiceInstanceNotificationCustomizer

[wcy666103]

What is the purpose of the change

delete SpringCloudServiceInstanceNotificationCustomizer

Brief changelog

Since then:

1. SpringCloud service calls dubbo service using http protocol
2. dubbo service calls SpringCloud service to make SpringCloud side transform

Verifying this change

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Add some description to dubbo-website project if you are requesting to add a feature.
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• If this contribution is large, please follow the Software Donation Guide.