fix: log path-like subprocess arguments without raising

[Shubham-Padkonde]

run_command accepts arguments supported by subprocess.Popen, but its final debug-log formatting passes each argument directly to shlex.quote. A pathlib.Path executable therefore runs successfully and then raises TypeError instead of returning its result.

Decode bytes and path-like arguments with os.fsdecode when constructing the display string, including standalone commands. The original arguments passed to the subprocess are unchanged. Tests cover mixed argument types and a real Python subprocess invoked through a Path.

Validation: both new regressions fail before the fix. Full Mobly suite: 826 passed, 5 skipped; 12 destructor warnings report unavailable ADB during snippet-client cleanup. Pyink 24.3.0 and git diff --check pass.

[xpconanfan]

Closing this PR. We do not accept AI-generated PRs targeting synthetic edge cases that contradict our documented API contracts.