[UX Polish] Improve field prompting and validation for Remote Connection

Description

Current screenshots (2022-12-07)

Step 1	Step 2

There's some UX improvements to be made:

• We shouldn't prompt the user for https:// or any other protocol since VSCode only expects the host.
• We shouldn't show an error message if the user cancels one of the inputs.
• The path needs to start with a /.
• [UX Polish] Add step counter to Remote-Connecti... (#48 - closed)