fix(dvcfs): rename argument url to repo

[skshetry]

See #10700 for the motivation.

• ❗ I have followed the Contributing to DVC checklist.

• 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

We need to rename the url to something else for fsspec.core.url_to_fs to work for dvc urls with storage_options.

We have two options to consider:

1. Repurpose the existing repo= argument to accept both str and Repo instances, or
2. Rename url= to something else (preferably repo), and introduce a new argument for accepting Repo instances.

Most of the API in dvc.api already uses repo= (as a str path to the DVC/Git repository, eg: dvc.api.open and dvc.api.read. So, I prefer the 1st option, as it will be a good opportunity to align naming and use repo= consistently.

But I am happy with either of the options.

Also note that accepting Repo instance is part of an internal API, and is done for avoiding cost of opening another DVC/Git repository.

Related:

• Broken Huggingface Datasets integration #10700
• fix(url_to_fs): mangle arg to avoid collision with kwargs fsspec/filesystem_spec#1802
• DVC integration broken huggingface/datasets#7421

[Copilot]

Pull Request Overview

This PR renames the argument "url" to "repo" for the DVCFileSystem, improving the clarity of parameter names.

• Updates tests to construct DVCFileSystem using the new "repo" parameter where possible while still supporting backward compatibility.
• Adjusts the init signature and deprecation fallback in dvc/fs/dvc.py.
• Updates dependency handling in dvc/dependency/repo.py to use the new argument name.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

File	Description
tests/unit/fs/test_dvcfs.py	Updated DVCFileSystem instantiation to remove deprecated "url" usage.
tests/unit/fs/test_dvc.py	Updated parameterized tests to cover both "repo" and legacy "url".
dvc/fs/dvc.py	Modified init to prioritize the new "repo" argument and handle fallback.
dvc/dependency/repo.py	Adjusted dependency creation to pass "repo" instead of "url".

Comments suppressed due to low confidence (1)

tests/unit/fs/test_dvcfs.py:781

• Consider updating the test to explicitly use the new 'repo' parameter, for example, as a positional argument or named 'repo', to align with the updated API design and improve clarity.

fs = DVCFileSystem(url=tmp_dir)

[skshetry]

Failures are unrelated and is likely due to a new pytest release. Will take a look separately.