cli: graduate progress-fd out of experimental

[jmarrero]

Stabilize progress-fd closing #1016.

Draft as we are still ironing out what else needs to be done before stabilizing.

[gemini-code-assist]

Code Review

This pull request successfully promotes the --progress-fd feature from experimental to stable. The changes are consistent across the codebase, including updating dependencies in Cargo.lock and ostree-ext/Cargo.toml, adjusting the CLI visibility in lib/src/cli.rs, and updating the documentation to reflect the new status of the feature. The changes are well-executed and I have no further suggestions for improvement.

[cgwalters]

I know this is just starting things, but for reference a lot of discussion in #1016 which should be clearly linked here in the PR description etc. Did you have any feedback/thoughts there?

Overall...yeah we could just basically do this and move on for now...but...

Actually though, at least for Anaconda this won't be useful until we do #982

[jmarrero]

I know this is just starting things, but for reference a lot of discussion in #1016 which should be clearly linked here in the PR description etc. Did you have any feedback/thoughts there?

Yeah, have had to read it a couple of times to understand the expectations here. Added a comment there and got some answers.

Actually though, at least for Anaconda this won't be useful until we do #982

OK, let's talk about that in #1016