fix(pack)!: adjust install confirm (no error on "No", show names)

Problem: Installation confirmation has several usability issues:
    - Choosing "No" results in a `vim.pack.add()` error. This was by
      design to ensure that all later code that *might* reference
      presumably installed plugin will not get executed. However, this
      is often too restrictive since there might be no such code (like
      if plugin's effects are automated in its 'plugin/' directory).
      Instead the potential code using not installed plugin will throw
      an error.

      No error on "No" will also be useful for planned lockfile repair.

    - List of soon-to-be-installed plugins doesn't mention plugin names.
      This might be confusing if plugins are installed under different
      name.

Solution: Silently drop installation step if user chose "No" and show
  plugin names in confirmation text (together with their pretty aligned
  sources).

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