Perf: Only glob for commands of that type when a command is passed in the cli args

Type: feature

The following has been addressed in the PR:

[x] There is a related issue
[x] All code has been formatted with prettier as per the readme code style guidelines

Description: This is a simple perf fix for when running a single command. At the moment we glob for all commands even when a command is passed in the cli args. This just narrows it to only glob for that command as a prefix, ie running:

dojo test

previously would result in:

/node_modules/@dojo/cli-*

and now results in:

/node_modules/@dojo/cli-test-*

dojo / cli

Perf: Only glob for commands of that type when a command is passed in the cli args #281