Check if all relevant options can be set via `sentry.properties`

### Description

We found some options (`send-default-pii` and `max-request-body-size`) that weren't parsed from external options (`sentry.properties`) and thus couldn't be configured for our Sentry OpenTelemetry Java Agent when using auto init.

We should investigate whether there's more options that should be configurable through `sentry.properties` but currently aren't.