- Honors `createBranch` flag for naming the worktree folder
- Falls back to the qualified remote branch name if the branch name already exists
- Always uses the qualified remote branch name via GHPR command

Fixes tags on the Graph for remote repos

Uses the core git fetch command instead of a command-line
git fetch so VsCode will prompt the user for their username
and password. Pull & push also use their corresponding core commands.

Aligns worktree open prompting using quick picks

- Always creates a new worktree from the "main" repo
 - Automatically shows the worktree view after creation
 - Adds `worktrees.openAfterCreate` setting