Add launch button, reduce wait, and better checking for status of Dev Boxes for config flow

[huzaifa-d]

Summary of the pull request

• Adds a launch button to directly login to a Dev Box in the case of "Waiting For Active User Session" while applying a configuration.
• Reduces the wait time for a task to resume to complement the fix by the Dev Box team. It is now 30 seconds for normal logins but two minutes in the case of first time login initializations.
• Rechecks the status of a Dev Box before applying a configuration. Earlier if a Dev Box was started in the background during the configuration flow setup, the extension wasn't aware and failed the configuration task.

Validation steps performed

Manually across multiple Dev Boxes

PR checklist

• Closes #Dev Box configuration waits a couple of minutes to show status devhome#2992
• Closes #Dev home does not refresh Dev Box Status after machine start devhome#2976
• Tests added/passed
• Documentation updated

[dhoehna]

Consider using the stopwatch class to keep track of how long the task took.

This method is prone to errors via DST.

[dhoehna]

I believe a less error-prone method of getting elapsed time is to use UTCNow.

[sshilov7]

Coding guidelines: Normally constant names don't start with "_": "Use PascalCase for constant names, both fields and local constants."