[MERGE] Change the `bzr init-repo` default to --trees (#53483)

[Wouter van Heyst]

The attached bundle changes the behaviour of `bzr int-repo` to make
working trees for branches by default. While the semantics of a
repository may change with tags, as long as it gets advertised as a
storage optimization only, the current behaviour is confusing.

Concerns:
- I copped out of a better NEWS entry since I've been blocking on that
  for too long during this sprint. So just complain about it here :)
- The help for init-repo is a direct conversion, writing a different
  example might be a better idea.

Wouter van Heyst
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