Use platform-specific text for "Reveal in <file explorer>" to match VS Code

Follow-up:

This should be "Reveal in Finder" on macOS and "Open Containing Folder" on Linux.  Can you make an issue and put it in the November milestone for fixing up this string?

_Originally posted by @Benjin in https://github.com/microsoft/vscode-mssql/pull/20505#discussion_r2511496098_
            