ceph-dev-new-setup: enable debug options for dev builds

ceph-dev-new-setup: enable debug options for dev builds

Note: it has been this way since at least 35e1a715. It's difficult to tell when
or even if ceph was ever properly built with debugging configurations for QA as
there are corresponding changes in ceph with the switch to cmake which makes
this challenging to evaluate.

It's likely that it was wrongly assumed that cmake would set the build type to
Debug because the ".git" directory would be present. This is not the case
because the "make-dist" script (executed below) creates a git tarball that is
used for the actual untar/build. See also:

https://github.com/ceph/ceph/pull/53800

Signed-off-by: Patrick Donnelly <pdonnell@ibm.com>