ask confirmation before switching to staging ota

Description

Issue(s)

https://gitlab.e.foundation/e/backlog/-/issues/4881

Test procedures

On teracube 2e

install https://gitlab.e.foundation/e/priv/os/build/-/pipelines/167921

or build a Q device with 4881-q-confirmation-ota feature branch

go to developper option, enable staging OTA server, you should get a dialog asking for confirmation like the one in screenshots

Technical details

Screenshots

Check list

• Self review
• Test procedure explained
• Tested on fresh install
• Tested applied as an update
• License
• Internal documentation
• User documentation