Fix T84202: Sculpt lasso mask crash after remesh.

'Caused'/revealed by rBd29a720c45e5: Operators that fully re-create the
mesh would previously rely on `sculpt_update_object` called from update
code to get required sculpt-specific data layers re-added to the new
mesh.

Now instead put all code adding data to orig mesh for sculpt purpose
into a new util function (`BKE_sculpt_ensure_orig_mesh_data`), and call
that function when entering sculpt mode, and from voxel remesher code.

This is contonuing effort to more clearly separate orig data from evaluated
data handling/usage in sculpt code.

TODO: there are likely other code paths that would need to call that
new function?

Reviewers: @sergey, @pablodp606

Subscribers:

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