RestApiExceptionFilter is used as an exception filter for the core
controller which is used for crud operations on our objects (equivalent
of our dynamic queries findManyPeople etc. on the graphql API).
Exceptions were leading a 400 / BadRequestException response status
which can be confusing to users.
By default we should actually throw a 500 if the error was not handled
priorily, but we have not implemented input validation for the REST api
so we fear to be flooded with errors that should not be 500 but 400 due
to user inputs. A solution should be brought [with this
ticket](https://github.com/twentyhq/core-team-issues/issues/1027) but it
has not been prioritized yet.
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