Allowed GitHub hosts

[eggyhead]

What are we doing?

Currently, we are only checking equality against github.com to ensure artifact and cache actions are being run in a non-enterprise host. We need to update this check to allow requests from ghe.com and ghe.localhost, additional allowed hostnames for production and local development.

Fixes https://github.com/github/actions-results-team/issues/2208

How are we doing it?

• We are including the known GItHub hostnames in the negative condition for isGhes

How do I test?

• Run upload or download artifact from an allowed host using this toolkit package version