A dropdown menu with available serial links would make this type of connection a lot easier

The hard part (the entire backend) for serial connections to work on Cockpit were already added on #1930, but for users that have MAVLink serial devices to use them with it, they basically need to know how to properly write the path of a serial link, and also to find out what's the path for the specific device that they are trying to use. That is not trivial, and a simple dropdown with the available links would make this feature a lot easier and increase adoption of users in this context (mainly aerial vehicles).

Start by reading issue #1930 to understand the existing serial-connection backend and then locate the frontend entry point for configuring MAVLink serial connections. The work is done when users can see available serial links in a dropdown and select one without manually entering its path.

Written by the indexing model from the issue text.