Update vulnerability and counts on group archived

What does this MR do and why?

Update vulnerability and counts on group archived

Contributes to: #572475

Depends on: !208364 (merged) (to link in the event properly)

This adds a new worker which will respond to the group archival event. It will archive the vulnerabilities in the namespace and then regenerate the statistics in the whole namespace.

Changelog: changed EE: true

How to set up and validate locally

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