Coverage configuration

[pablostu]

configuration settings can be configured in .vscode-test.mjs and it is usually sufficient.
But it does not work for coverage settings, just putting the parameters in the file does not work,
because additionally a command line argument is required to activate coverage reporting:

https://github.com/microsoft/vscode-test-cli/blob/02cbeb4dec43505f0407bb89a191e96f5106c0f4/src/bin.mts#L153C9-L153C18

this was slightly confusing to me. if I configure something in a file, I assume no additional command line paramter is required...