fix(security): validate --upload and --output file paths#374

AshwinRenjith wants to merge 4 commits intogoogleworkspace:maingoogleworkspace/cli:mainfrom

AshwinRenjith:ashwin/codex/pr1-path-validation-upload-outputAshwinRenjith/cli:ashwin/codex/pr1-path-validation-upload-outputCopy head branch name to clipboard