Improvement: Check for exactly one new line at the end of the file

### What

Time and focus is lost in a PR review when files do not have exactly one new line at the end of the file. To save time from everyone we want this to be enforced in checks and not rely on the reviewers.

### How

For C++, we have this configured in clang-format. We should check if for Starlark, Python, and Rust, it can be configured in the corresponding formater.

### Estimates for realization

_No response_

### Category

- [ ] Affects Detailed Design

### Requirements / Architecture

- [x] Requirements / Architecture are not affected by this change?