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

[sentry]

This PR addresses a UnicodeDecodeError that occurred when codecov-cli attempted to decode git command output containing non-UTF-8 bytes, particularly in filenames or branch names.

The root cause was identified as the use of bare .decode() calls (which default to strict UTF-8) on subprocess.run stdout, leading to crashes when encountering invalid byte sequences (e.g., 0xc0).

The fix involves updating all relevant .decode() calls in codecov_cli/helpers/versioning_systems.py to explicitly use decode("utf-8", errors="surrogateescape"). This standard Python idiom for handling filesystem paths ensures that non-UTF-8 bytes are preserved as surrogate characters instead of raising an exception, allowing the CLI to gracefully process repositories with such names.

Fixes CLI-BD

[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 1625 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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