[type:feat]Alert module adapts to namespace transformation

[478320]

Make sure that:

• [x] You have read the contribution guidelines.
• [x] You submit test cases (unit or integration tests) that back your changes.
• [x] Your local test passed ./mvnw clean install -Dmaven.javadoc.skip=true.

[478320]

https://github.com/apache/shenyu/issues/5623

[moremind]

pls modify these changes, and check the alert module for shenyu-bootstrap

[moremind]

pls add my wechat: yijia1949