Remove legacy `publicKey` and `privateKey` property from `UserDto`
Open
- Dominant language
- Java
- Stars
- 80
- Forks
- 15
- PR merge metrics
- No merged PRs in 30d
Description
### Please agree to the following
- [x] I have searched [existing issues](https://github.com/cryptomator/hub/issues?q=) for duplicates
- [x] I agree to follow this project's [Code of Conduct](https://github.com/cryptomator/hub/blob/develop/.github/CODE_OF_CONDUCT.md)
### Summary
When we release a new major release, we drop these properties to simplify and reduce the size of the response.
### Motivation
See summary.
https://github.com/cryptomator/hub/blob/afc7a17957c665e3ec6897eb792a093633994ba2/backend/src/main/java/org/cryptomator/hub/api/UserDto.java#L30-L36
### Considered Alternatives
_No response_
### Anything else?
_No response_
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Assessment
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