Add errors parameter to subprocess.call and check_call

[dannyshafer]

Fixes #16538.

call() and check_call() forward their keyword arguments to Popen, which accepts errors, so this adds errors: str | None = None to both (https://docs.python.org/3/library/subprocess.html#subprocess.call).

Prepared with Claude Code.

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

scipy-stubs (https://github.com/scipy/scipy-stubs)
+ tests/misc/test_submodules_empty.pyi:3: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports