fix: correctly handle DNS lookup on localhost, and fallback if needed

[BrandonGillis]

Description

This PR is the following of #1136, this should work as the previous PR @helloanoop even though I did some refactoring.

what changed :

• removed the connectivity cache if it fail, this allow handling edge case like :

  • my localhost server is stopped, I do a request with bruno (fail), I start my server, do a request with bruno (success)

• added dns.lookup first if localhost resolve to a special IP, check the connectivity, and fallback to the custom handling if needed.

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.