Feat: Configurable retry count/interval

[idubnori]

My suggestion is the following should be configurable.

https://github.com/actions/checkout/blob/main/src/retry-helper.ts#L3-L5

Background / Purpose

If the repository does not exist, retry will be a waste of CI execution time.
e.g. Checkout GitHub Wiki repo but Wiki may not be existed if feature is disabled

[shink]

same issue