Improve treesit-forward-sexp behavior for leaf nodes (bug#68899)

treesit-forward-sexp uses treesit--navigate-thing with 'restricted'
tactic.  In this tactic we don't move over the parent thing.  However,
this makes forward-sexp useless for symbols when point is in the
symbol rather than at the beginning of it: in that case, the symbol is
considered parent and treesit-forward-sexp won't move to the end of
it.

To solve that, we allow to move across the parent even in 'restricted'
mode if the parent is a leaf thing.

Here, "leaf thing" is defined as "doesn't have any child 'thing'
inside it".

* lisp/treesit.el (treesit--navigate-thing): Move over parent in
'restricted' tactic if the parent is a leaf thing.

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