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

从 Tools/patchcheck/patchcheck.py 中的 get_git_upstream_remote() 开始，检查 git remote -v 的输出是如何被过滤的。使用 --filter=blob:none 进行 partial clone 来复现，并验证在适当情况下能够检测到 upstream fetch remote，并将其包含在错误输出中。当 patchcheck 即使面对追加的 [blob:none] 文本仍能识别 upstream remote 时，即表示完成；关联的 PR gh-156065 已经存在。