In this PR, I'm
- removing setting up the isAppWaitingForFreshMetadata boolean state in
PageChangeEffect navigate (not robust) to some precise synchronous
places, improving the control we have on when the app considers it's
ready to be rendered based on fresh metadata
- fixing tests
In this PR
1. Enable deletion of relation fields in the product and via the api
(migration part was missing in the api)
3. Change wording, only use "deactivate" and "delete" everywhere (and
not a mix of the two + "disable", "erase")
