mgr/dashboard: Made grafana iframe scrollable and height consistent

mgr/dashboard: Made grafana iframe scrollable and height consistent
Fixes : https://tracker.ceph.com/issues/72044

Signed-off-by: Abhishek Desai <abhishek.desai1@ibm.com>
(cherry picked from commit 64361708338a8cf97de7f7d4f2768c109a50c82f)

 Conflicts:
	src/pybind/mgr/dashboard/frontend/src/app/ceph/cephfs/cephfs-list/cephfs-list.component.html
	src/pybind/mgr/dashboard/frontend/src/app/ceph/cephfs/cephfs-tabs/cephfs-tabs.component.html
	src/pybind/mgr/dashboard/frontend/src/styles.scss
	src/pybind/mgr/dashboard/frontend/src/app/ceph/cephfs/cephfs-list/cephfs-list.component.html
	src/pybind/mgr/dashboard/frontend/src/app/ceph/cephfs/cephfs-tabs/cephfs-tabs.component.html