Adds "Stale" and "Waiting for Response" labels

[klenotiw]

WHY are these changes introduced?

Working on https://github.com/Shopify/first-party-library-planning/issues/458

WHAT is this pull request doing?

This PR adds two new labels "Stale" and "Waiting for Response". Stale will be added to any issue that hasn't had activity for 90 days. If an issue is labeled as "Stale" and dose not have activity for an additional 14 days it will be closed automatically. The "Waiting for Response" label is added manually to an issue, if one of our devs is waiting for clarifications on a ticket. If the ticket doesn't see activity for 7 days it will be closed automatically. If it does see activity then the label is removed automatically.

Type of change

• [ ] Patch: Bug (non-breaking change which fixes an issue)
• [ ] Minor: New feature (non-breaking change which adds functionality)
• [ ] Major: Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• [ ] I have added a changelog entry, prefixed by the type of change noted above
• [ ] I have added/updated tests for this change
• [ ] I have documented new APIs/updated the documentation for modified APIs (for public APIs)

[klenotiw]

I can see there is a stale.yml file in this repo but I am not sure how exactly it works. We can remove my stale.yml workflow if the other one works fine.

[mkevinosullivan]

I can see there is a stale.yml file in this repo but I am not sure how exactly it works. We can remove my stale.yml workflow if the other one works fine.

I committed it originally but it didn't work ... never went back to make it work 🤦🏻‍♂️ It can be safely deleted in preference for yours!