**Context**
cf. feature request
[#4597](https://github.com/twentyhq/twenty/issues/4597)
Enables deletion of custom fields that aren't active nor of type
relation
Also
1. renamed a misnamed file
2. deleted redundant hook BeforeDeleteOneField as it seemed best to move
the logic to the resolver instead
**How was it tested?**
Did not write unit tests as code is to be migrated (discussed with
@Weiko).
Locally tested.
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Co-authored-by: Marie Stoppa <mariestoppa@MacBook-Pro-de-Marie.local>
