fix: set multiple psl

[mshanemc]

What does this PR do?

fix: the gh issue so that you can pass multiple PSL by name, with a nut to validate it
feat: avoid throws for "PSL-not-found" scenario so partial success returns
fix: improper use of ux.table columns that resulted in the error messages not being displayed (only the usernames)
refactor: get rid of the base class and use functions from both commands that need this.

note: the old, deprecated force: version of this command doesn't get the new upgrade to support multiple --name

What issues does this PR fix or reference?

forcedotcom/cli#2744
@W-15109060@

[shetzel]

QA:

plugin-user/bin/run.js org assign permsetlicense -n "Commerce User" -n "Health Cloud"
Warning: The user "[email protected]" already has the Permission Set License "Commerce User"
=== Permset Licenses Assigned

 Username                      Permission Set License Assignment
 ───────────────────────────── ─────────────────────────────────
 [email protected] Commerce User
 [email protected] Health Cloud

plugin-user/bin/run.js org assign permsetlicense -n "Commerce User" -n "Orders Platform"
=== Partial Success

=== Permset Licenses Assigned

Username                      Permission Set License Assignment
───────────────────────────── ─────────────────────────────────
[email protected] Commerce User

=== Failures

Username                      Error Message
───────────────────────────── ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
[email protected] User User can't be assigned the Orders Platform permission set license, because User User's user license doesn't support it.: User ID