[feat] Git-sensor enhancements.

[prakarsh-dt]

Summary

• Show inactive marked Git repos with timestamp prominently on UI.
• Mark the directories active if user manually fetched the commits from the UI and was successful.

Motivation

Git-sensor marks the git repos inactive if it is unable to fetch commits from it due to any reason. The enduser has absolutely no information when this happens and gets stuck as the new commits are not fetched automatically (or manually) when he/she tries to trigger a build.

Proposal

Provide more transparency to the user with warnings/error and auto-recovery

AB#435