Validate personal access token right after the user added it
Problem to solve
Users can add a personal access token that is invalid or expired, or they make a typo when entering the instance URL.
The extension will save this potentially incorrect pair (instance URL, token) and the user will find about the invalid token later when they try to use some of the extension functionality
Proposal
Validate the token instantly after the user adds it. We can do that by calling instanceUrl/api/v4/version
API endpoint.
Further details
Thanks @pslaughter for suggesting this typefeature