Replace deprecated ReportUnit

[gep13]

https://github.com/reportunit/reportunit

This has been replaced by:

https://github.com/extent-framework/extentreports-dotnet-cli

[gep13]

In order for this to be done, a new Addin would need to be created. Not sure if this is something that will be undertaken in the timeframe of 2.0.0.

[AdmiringWorm]

@gep13 if the arguments are the same, we could just use Context.Tools.Resolve and set it as the tool to use (perhaps).

[gep13]

Ooo, haven't looked at that, perhaps...

[AdmiringWorm]

Had a quick look, and it seems the new tool, unfortunately, do not have the same arguments.

[AdmiringWorm]

Opened a request for an addin for the tool: https://github.com/cake-contrib/addin-requests/issues/14