Also tidies up error notifications so that in the case of syntax errors
we don't see noise about the migration failing as well.
Release Notes:
- Invalid values in settings files will no longer prevent the rest of
the file from being parsed.
When we refactored settings to not pass JSON blobs around, we ended up
needing
to write *a lot* of code that just merged things (like json merge used
to do).
Use a derive macro to prevent typos in this logic.
Release Notes:
- N/A
Conrad Irwin
Mikayla MakiandNia