Fix/pre commit whitespace

## Description

Applies whitespace fixes for pre-commit checks so that those stop being a source of errors in the future.

Marked as WIP as this requires !417  to be merged first. I'll rebase (if needed) once that's done.

First step of #36

Ran `echo 'end-of-file-fixer trailing-whitespace mixed-line-ending' | xargs -n 1 pre-commit run --all-files`

## How Has This Been Tested?

This change only does:

- end-of-file-fixer
- trailing-whitespace
- mixed-line-ending

None of which affect the code, so no real checks were performed.

## Relevant Documents (optional)
<!-- Include any relevant screenshot, elogs, reports, if appropriate. -->

## Types of changes

Formatting fixes

## Checklist:
<!--- Go over all the following points, and uncomment all lines that apply: -->

- My code ~~follows~~ implements the code style of this project.

## Reviewers

@danilevc @ahmedk @hammerd

See merge request detectors/pycalibration!433