Add ability to auto-assign users when specific label is added to label plugin

[smg247]

We need a way to automatically assign users to a PR when a specific label is added. We can leverage the configuration of restricted labels in the label plugin to accomplish this. This is the implementation for the enhancement described in Issue 24394.

I also updated the plugin help to include information on restricted labels.

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[hongkailiu]

/ok-to-test

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Stephen Goeddel (c991fcd, 508130b)

[smg247]

/test all

[alvaroaleman]

thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, smg247

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