Remove `--info-verbosity verbose` from webpack command line

[eamodio]

Prior to Webpack 5, --info-verbosity verbose was needed for proper problem matcher support, but that option no longer exists (and is thankfully unneeded for problem matcher support).

With that flag, Webpack will die with the following:

[webpack-cli] Unknown argument: --info-verbosity

This also completely breaks the F5 ability -- as the build will fail.

[ilbrando]

Was this the feature which displayed that webpack was beginning compilation and that it has finished? I found that very useful because it made it easy to see when a new output was ready. Is it possible to re-introduce showing this information again?