Add an option to disable the new interactive rebase UI

[idoberko2]

I'm using VS Code as my git editor, i.e. my git config contains the following line:

core.editor=code --wait

I'm use to benefit from VS Code's great editing features to perform various git operations.

The latest update introduced a new feature: a UI for the interactive git rebase: https://code.visualstudio.com/updates/v1_51#_git-rebase-command. There's currently no way to disable this feature which forces me to use other editors for git.

I think a disable feature in the settings (turned off by default) could benefit all users: both users that wish to use the new UI, alongside users that wish to use a text editor.

[eamodio]

The new UI for rebasing isn't from VS Code, it is from GitLens. And it can be disabled by adding the following to your settings.json

	"workbench.editorAssociations": [
		{
			"viewType": "default",
			"filenamePattern": "git-rebase-todo"
		}
	],