Docs: Update list of `report_to` logging integrations in docstring
# What does this PR do?

## Pull Request overview
* Add missing `dagshub`, `codecarbon` and `flyte` integrations to `TrainingArguments` docstring.
* Update `report_to` type hint to allow strings.

## Details
I also converted the ordering back to alphabetical. 

I considered using a typing `Literal` as the type hint to help users via their IDE, but I haven't implemented it here as to not clash with the existing style. 

## Before submitting
- [x] This PR fixes a typo or improves the docs

## Who can review?

@sgugger

- Tom Aarsen

_The documentation is not available anymore as the PR was closed or merged._