Force short date pattern to use yyyy on Linux (dotnet/coreclr#18316)

Force short date pattern to use yyyy on Linux (dotnet/coreclr#18316)

* Force short date pattern to use yyyy on Linux

The default pattern we get is using yy which causes the years  to be displayed  as 2 digits. This is not acceptable for many users. The fix here is to force 4-digit year as a default and still keep the original pattern which has 2-digits year in the optional list

* Address the review feedback

Commit migrated from https://github.com/dotnet/coreclr/commit/a51328304a95a1a5e0eb037883176dff248dc687