Connector form: Improve logs rendering on failing connection test

[flash1293]

With advanced mode enabled, the logs from the connection test job are shown below the form together with the error message:

This UI is confusing users because it looks like it failed and worked at the same time. By replacing the standard collapsable with a more subtle "Show logs" button, this UI can be cleaned up. In this case it also makes sense to always show this button even in non-advanced mode.

[octavia-squidington-iv]

cc @airbytehq/frontend

[flash1293]

Pending for review, but we focused on the connector builder UI PRs for now.