fix: prevent UnicodeDecodeError from non-UTF-8 git paths

[sentry]

This PR addresses issue CLI-BD, where the Codecov CLI would crash with a UnicodeDecodeError when encountering git repositories containing filenames with non-UTF-8 byte sequences.

The root cause was identified in codecov_cli/helpers/versioning_systems.py, specifically in the list_relevant_files function. The output of git ls-files was being decoded using a bare .decode() call, which defaults to UTF-8 and raises an error when invalid byte sequences are encountered.

The fix involves adding errors='surrogateescape' to the .decode() call. This error handling strategy allows undecodable bytes to be represented as Unicode surrogate characters, preventing the UnicodeDecodeError and ensuring that the CLI can process repositories with such filenames without crashing, while preserving the original byte information.

Fixes CLI-BD

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[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
723	1	722	1

View the full list of 1 ❄️ flaky test(s)

api.temp.calculator.test_calculator::test_divide

Flake rate in main: 100.00% (Passed 0 times, Failed 1726 times)

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

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