Summary:
this new flag will only call into "install" and not "initialize", allowing
the user to do a install without setting up the data directory. 'yba-ctl
start' will now call into initialize if it is required.

This will allow a --without-data install, mounting a new data disk
to /opt/yugabyte/data, then starting yba. Later, that disk can be unmounted
and then remounted to another --without-data install (of the same version).

Test Plan:
1. regular install --without data -> start. YBA is up and running and usable
2. --without-data, mount disk, start. YBA is usable
3. stop yba from 2), unmount disk. Re-install yba (--without-data), and remount disk
after starting yba, it has all the data created during 2)

Reviewers: muthu, sanketh

Reviewed By: muthu

Subscribers: yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D37779