channel diff shows update with no changes

[indirectlylit]

Observed behavior

The channel update diff from version 95 to 96 showed no updates:

Presumably, if Studio allowed a new version to be published then something changed. If that's not the case we should open an issue over there.

Expected behavior

If there was a change that can't be described by one of the existing categories of changes (new, deleted, updated resources) we may need a new row e.g. "channel metadata updated". This doesn't need to be a count, but could be just a statement.

User-facing consequences

confusing diff on upgrade

Steps to reproduce

• Inspect the change that occurred in version 96 of nakav-mafak
• Replicate and attempt upgrade

Context

0.15.0-beta3

This will be resolved by:

### Tasks
- [ ] Adding a flag for 'metadata updated' - one thing to note is that this will be a significant technical challenge to implement for a very small reward, so this will be very low priority.
- [ ] Properly flagging when supplemental files have changed/been updated