mgr/dashboard: Use htmllint (#30998)

Reviewed-by: Stephan Müller <smueller@suse.com>
Reviewed-by: Tatjana Dehler <tdehler@suse.com>
Reviewed-by: Volker Theile <vtheile@suse.com>

diff --cc src/pybind/mgr/dashboard/frontend/src/app/ceph/block/iscsi-target-form/iscsi-target-form.component.html
Simple merge