[Proposal] Don't reuse slugs on relisting

It may be that once a job listing has been marked as filled and `noindex` tag is added that Google (+ others?) gets shy about reindexing those pages once they are relisted. It might be worth considering appending something unique to the slug when a job listing is relisted. For example:
https://example.com/jobs/my-example-listing
https://example.com/jobs/my-example-listing-2
https://example.com/jobs/my-example-listing-3

The issue names no files, tests, or entry points. Begin by locating the code that handles relisting job listings and generates their slugs, then determine how a unique slug should interact with noindex behavior and define tests for successive relistings.

Written by the indexing model from the issue text.