patchcheck does not recognise the upstream remote in a partial clone (git remote -v appends "[blob:none]")

Bug report

Bug description:

make patchcheck fails to find the upstream remote in a partial clone (git clone --filter=blob:none ...), even when the remote is named upstream and points at https://github.com/python/cpython:

ValueError: Patchcheck was unable to find an unambiguous upstream remote, with URL matching 'https://github.com/python/cpython'. For help creating an upstream remote, see Dev Guide: https://devguide.python.org/getting-started/git-boot-camp/#cloning-a-forked-cpython-repository
Remotes found:
origin	https://github.com/ekanshul/cpython.git (fetch)

Since Git 2.37 (git/git@ef6d15ca53), git remote -v appends the object filter of a promisor remote to its fetch line:

$ git remote -v
origin	https://github.com/ekanshul/cpython.git (fetch)
origin	https://github.com/ekanshul/cpython.git (push)
upstream	https://github.com/python/cpython.git (fetch) [blob:none]
upstream	https://github.com/python/cpython.git (push)

get_git_upstream_remote() in Tools/patchcheck/patchcheck.py (from #135806) selects fetch lines with remote.endswith("(fetch)"), so the partially-cloned upstream is dropped both from the candidates and from the "Remotes found" list in the error message, which makes the message misleading too. Matching "(fetch)" anywhere on the line fixes it.

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS (git 2.50.1)

Linked PRs

• gh-156065

Tools/patchcheck/patchcheck.py の get_git_upstream_remote() から始め、git remote -v の出力がどのようにフィルタリングされているかを調べてください。--filter=blob:none を使った partial clone で再現し、upstream の fetch remote が検出され、適切な場合にエラー出力に含まれることを確認してください。patchcheck が末尾に追加された [blob:none] というテキストがあっても upstream remote を認識できれば完了です。リンク先の PR gh-156065 はすでに存在します。