[GHO-8623] Provider defaults to api.ghostsecurity.com

[Fitzse]

👻 Ghost Linear Issue

📑 Description (what does this PR add, change, remove)

This adds some bare-bones acceptance tests for the ghost_log_forwarder resource and defaults the provider configuration to https://api.ghostsecurity.com if endpoint is not specified.

✅ Checks

• My pull request adheres to the code style of this project
• My code required changes to the documentation; I've included those changes
• I've added tests to support this change (where applicable)

[linear]

GHO-8623 Provider endpoint default to production API

The endpoint configuration for the Ghost provider should default to the production https://api.ghostsecurity.com URL if not specified.