* fix(test):C# example ineffective in CI under TDegnine/example (#14472)

* fix(test):C# example ineffective in CI under tdegnine/example

* fix(test):C# examples add into CI cases.task

* test(fix):update C# CI example target framework to NET 6.0

* fix(test):C# example in CI, path incorrect

* fix(test):C# example CI ineffective

* fix(test):C# example CI taosdemo realese path incorrect

* fix(test):change C# ci example targetframe work to net5 in 2.6 branch