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

從 Tools/patchcheck/patchcheck.py 中的 get_git_upstream_remote() 開始，檢查 git remote -v 的輸出是如何被篩選的。使用 --filter=blob:none 進行 partial clone 來重現，並確認在適當情況下能偵測到 upstream fetch remote，且將其包含在錯誤輸出中。當 patchcheck 即使面對附加的 [blob:none] 文字仍能辨識 upstream remote 時，即表示完成；關聯的 PR gh-156065 已經存在。