Refactor: migrate test infra for br/pkg/logutil/loggin_test.go to testify (#28557)
Refactor: migrate test infra for br/pkg/logutil/loggin_test.go to testify (#28557)

 
pingcap/tidb,coocood/tidb,kyle-wang/tidb,pingcap/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,pingcap/tidb,c4pt0r/tidb,ngaut/tidb,coocood/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,pingcap/tidb,kyle-wang/tidb,c4pt0r/tidb,ngaut/tidb,ngaut/tidb,c4pt0r/tidb,pingcap/tidb,kyle-wang/tidb,c4pt0r/tidb