fix(cron): Ignore time sensitivity when a class was explicitely scheduled

[nickvergessen]

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[kyteinsky]

can we add an explicit arg like -f to ignore the time sensitivity?
This will also keep the old behaviour in case someone/thing uses that.

[kyteinsky]

there might not be so many people relying on the niche behaviour

[nickvergessen]

/backport to stable31