Use the requested log level when handling broken stdout pipe

[cjerdonek]

This is a follow-up to PR #5907.

I noticed a tiny issue where, if a broken stdout pipe occurs and the user passed --log, then pip will print the traceback for the broken pipe even if the user didn't request verbose logging. This is because pip sets the root logger level to DEBUG if --log is passed:

pip/src/pip/_internal/utils/logging.py

Lines 233 to 238 in fc9bb60

	# The "root" logger should match the "console" level *unless* we also need
	# to log to a user log file.
	include_user_log = user_log_file is not None
	if include_user_log:
	additional_log_file = user_log_file
	root_level = "DEBUG"

This PR changes the logic inside inside the base Command.main() to use the user's requested log level instead of the root logger level when deciding whether to print the broken pipe traceback.

[lock]

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