SCM Incoming/Outgoing: Support context actions

[joaomoreno]

Testing #199177

I realize this is an open ended request but I wish I had these context actions when right clicking on commits:

Incoming:

• Fetch
• Pull

Outgoing:

• Push

History item (incoming):

• View Commit
• View All Changes
• Checkout commit
• Pull up to
• Rebase to

History item (outgoing):

• View Commit
• View All Changes
• Checkout commit
• Revert commit
• Push up to
• Reset to commit (with modal confirmation since it is destructive)

History item change:

• Open file
• Open changes in commit (using the multi-diff editor)
• Revert change (goes to working tree)

[joaomoreno]

Marking this as done. @lszomoru go ahead and file individual feature requests for all actions you still think would be useful.