Recover long stopping environments

Why

See Recover and long running stuck-stopping environ... (#425162 - closed) for more.

We want to recover environments that have been stuck in a stopping state for too long.

What

• add new scope to represent the environments that have been stuck stopping for too long
• add a service that can look for the environments and recover them
• call service from existing cron job
• add specs

Database

https://console.postgres.ai/gitlab/gitlab-production-tunnel-pg12/sessions/23704/commands/76135

Screenshots or screen recordings

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Before	After

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.