curently if user want to utilise the new flags with upgrade
user dont have the ability for it
Add the steps so user can make use of it

closes: rook#14368

Signed-off-by: parth-gr <partharora1010@gmail.com>

…-doc

doc: add upgrade steps for external cluster

The daily upgrade tests were checking for a specific
version of the rook image instead of the local_build tag
that is set as the rook base image since 14486.

Signed-off-by: Travis Nielsen <tnielsen@redhat.com>

tests: Check for correct base rook version during upgrade