Add `pac plugin push --pluginId <uniquename>`

[filcole]

We can update a plugin package via

pac plugin push  --pluginId 532b974f-e827-ef11-840a-002248c60dce

However we have to find the GUID via the Plugin Registration Tool (pac tool prt), see screenshot below:

It would be more user-friendly to be able to specify the unique name. i.e. something similar to below.

pac plugin push --pluginid xxx_Plugins

Note: The xxx_Plugins just an example name.