Add instructions to clear sidekiq idempotency key
What does this MR do and why?
Docs only change, adds instruction for clearing sidekiq idempotency key as provided in the following snippet by @mkozono: https://gitlab.com/-/snippets/2435333
I was facing an issue when troubleshooting my Sidekiq instance today where cronjobs were not running -- this managed to solve the issue for me so I believe the docs would be useful for others administering their own self-hosted gitlab instances
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