Swap commands so that click command opens work item in Azure Boards

[alexcnichols]

• Click item invokes open command (instead of invoking the mention command)
• Add tooltip
• Make mention command conditional upon there being a git repo
• Remove context menu for now
• Bring in Dan's change to add a pencil inline icon as well

[danhellem]

@alexcnichols can you take a look at my PR? we are going to have a conflict and I was curious on what you think is a better approach.