fix: emit a deprecation warning for https and don't mention it in generated config

[G-Rath]

Summary

If this flag is deprecated then it shouldn't be mentioned in the generated config because that just encourages its usage; we should also be omitting a deprecation warning so people know to move off it

Pull Request checklist

• Add/update test to cover these changes
• Update documentation
• Update CHANGELOG file

[G-Rath]

CI is currently failing because of a recent Yarn v1.22.21 change which it sounds like is causing general problems - I've not seen any evidence that it actually breaks standard projects (i.e. CIs for package_json and rails-template are still passing across all package managers), and I think this can be fixed here by just adding SKIP_YARN_COREPACK_CHECK to CI but I'm going to do some debugging via #383 first

#383 fixes CI

[ahangarha]

This is fine to me. If this is deprecated in webpack, then we should also deprecate its equivalent in Shakapacker.

[justin808]

Nice.

Please fix changelog conflict and merge.