Changes stash[Apply|Delete|Save] commands to use new git commands

Adds explicit directive for going back
Adds command error logging
Removes unneeded abort error

it's the same as #548 for ansible language

Adds arbitrary ref support to cherry-pick git command
Enhances the feedback when choosing an arbitrary ref

Changes checkout in views to run via git commands
Changes fetch in views & palette to run via git commands
Changes pull in views & palette to run via git commands
Changes push in views & palette to run via git commands
Adds skip confirmation support for some git commands
Adds gitCommands.skipConfirmation setting
Adds force option to push git command
Adds local branch creation to remote branch checkout git command
Adds arbitrary ref support to checkout git command

Fixes focus issues with compare picker

Lays some groundwork for the coming timeline webview