[Feature] Integrate codecov for test coverage,and enable AI generated test coverage suggestion in PR

[omonimus1]

[Feature] Integrate codecov for test coverage,and enable AI generated test coverage suggestion in PR
https://about.codecov.io/blog/write-comment-get-tests-ai-test-generation-is-now-in-your-pr/?utm_source=email&utm_medium=email&utm_campaign=codecov-fy26q2-testcoverage&utm_content=blog-readblog-read&mkt_tok=Nzc2LU1KTi01MDEAAAGa0VFSYVVHKp4b2_OFWCGOJKxnxhZMTkEahHrQqYqSUHmUeRnQK8XSpMAFjCit1umc0rIp_B_v9cg9vf_k2HV7ClMMFV9SIj7H_9CmHMB7IaxK