Feature: delete --ignore-not-found

[JonathanAtCenterEdge]

delete will fail if the passed --key isn't found

delete --ignore-not-found could still succeed if there isn't a matched key, this would be useful in situations where we only want to make sure a given --key doesn't exist, instead of first parsing list before running a delete

[joshmgross]

👋 This extension is being deprecated in favor of the built-in gh cache functionality of the gh CLI.

#86

If this is something you'd like gh cache to support, please file an issue in https://github.com/cli/cli.