Merge branch 'sg/completion-worktree'

The command line completion (in contrib/) learned to complete
subcommands and arguments to "git worktree".

* sg/completion-worktree:
  completion: list paths and refs for 'git worktree add'
  completion: list existing working trees for 'git worktree' subcommands
  completion: simplify completing 'git worktree' subcommands and options
  completion: return the index of found word from __git_find_on_cmdline()
  completion: clean up the __git_find_on_cmdline() helper function
  t9902-completion: add tests for the __git_find_on_cmdline() helper

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