Add ADO.NET Provider support MySqlConector 0.x and 1.x. (dotnet#6831) (…

…dotnet#6860)

Co-authored-by: Han Liu <[email protected]>

Probe silos indirectly before submitting a vote (dotnet#6800) (dotnet…

…#6839)

* Probe silos indirectly before submitting a vote (dotnet#6800)

* Probe silos indirectly before submitting a vote

* Improve tests

* Remove no-longer necessary cases in SiloHealthMonitor, since concurrency has been removed.

* Changes for 3.4.0