rename emulator image

Description

Use proper name for emulator images to avoid issues with publication

Issue(s)

https://gitlab.e.foundation/e/os/backlog/-/issues/1053

Test procedures

create a new pipeline in https://gitlab.e.foundation/e/priv/os/build/-/pipelines/new with v1-r branch

DEVICES: x86

build it

artifact name should be something like IMG-e-1.11-r-*-test-x86.zip

publication to staging should work

see here for result https://gitlab.e.foundation/e/priv/os/build/-/pipelines/283217

Check list

• Self review
• Test procedure explained
• Tested on fresh install