Add image promotion step to release cut issue template
Add image promotion step to release cut issue template

Adds image promotion step and krel command for opening PR against k8s.io
with images for release version. This step is required for all releases
since VDF.

Signed-off-by: hasheddan <fff88e83cd964a817f9e74a48f8df9cd0b6b9759@gmail.com>

kubernetes/sig-release