.clang-tidy: enable cppcoreguidelines-avoid-const-or-ref-data-members

Enable:

  https://clang.llvm.org/extra/clang-tidy/checks/cppcoreguidelines/avoid-const-or-ref-data-members.html

Set the `AllowMissingMoveFunctionsWhenCopyIsDeleted`, so it's less
verbose when you just want to delete everything.

Set `AllowSoleDefaultDtor`, because we have legitimate cases (when
defining virtual base classes) where we only define a default
destructor.  Perhaps there's a pitfall I don't see when allowing this?

Change-Id: I4a8d20c0be628ac807db4c6b52548e3b7d7ee286
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12090
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>