move to uv in the Dockerfiles.

[sayakpaul]

What does this PR do?

This PR updates the Dockerfiles to use uv for package resolution and installation. Once this PR is merged and the new Dockerfiles are pushed (should be done by Wednesday, hopefully) will update the actions to make use of uv.

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[DN6]

We can also add this to the install statements in the workflows right? e.g. We install accelerate and PEFT from source in the push tests.

[sayakpaul]

We can also add this to the install statements in the workflows right? e.g. We install accelerate and PEFT from source in the push tests.

I would prefer not to install uv in the action workflows. Once the Docker containers are updated with uv installed in them (this PR), we just use uv in the action workflows. This will be a follow-up PR, as mentioned in the OP of this PR.

LMK if that helps.

[DN6]

LGTM 👍🏽