chore: replace status: label from issue with status:in-progress once targeted with PR

[HonkingGoose]

What would you like Renovate to be able to do?

Issues get labeled status:requirements and status:ready on a consistent basis, which is good.
We are nowhere near as consistent with applying the status:in-progress label for things that are in progress.

I see issues targeted with a PR still say: status:requirements or status:ready, while they should be status:in-progress.. 😄

Did you already have any implementation ideas?

Find a way to automate replacing the status:ready and status:requirements labels with status:in-progress when a PR targets the issue for closure. If the issue gets targeted with a PR, that's a definite sign that somebody is working on implementation.

[rarkins]

On PR open or PR body update we should:

• Check the PR body for any instances of the following syntax: https://docs.github.com/en/github/managing-your-work-on-github/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword
• If found, ensure the issue(s) have status:in-progress if they are open

FYI I checked GitHub's GraphQL scheme for PullRequest and it doesn't appear to have any way to query a PR to find the list of associated issues it resolves, so therefore I suggest doing the query ourselves